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Discussion Starter #1
So I am in a bit of a pickle.

My nav screen backlight was not working when I purchased the car. I could see the menu on the screen in the right light, but nothing at night. I pulled the nav unit, and sent it away to bimmeronly to get the lcd replaced. That was completed, and was sent back to me and I was told it worked perfectly and had been tested in an M5 in their shop. I installed the nav unit in my M5, and I still have no backlight.

Coincidentally, I also purchased a MKIV as well, so I decided to install that to see if that fixed the issue. It did not. I could see the new menu, so I knew it was working, but still no back light.

I am currently at a bit of a loss. The bimmeronly guy says he thinks it may be the wire in the nav harness that controls its self dimming mechanism, but I am unsure of how to figure this out.

I pulled out a multimeter and checked all the pins in the blue (power) harness going into the nav display. Found a few interesting things. Not all pins seemed to be used and I marked these with an 'X'. Also, when I measured voltage of some pins, the voltage seemed to die from a reading of like 6.6V down to 0.01V. Not really sure whats going on there. I could also only find one pin that varied voltage with the light switch or dimmer control.

Anybody have any thoughts? Ideas? Maybe a pin out diagram??

Thanks for the help.

Rob
 

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Discussion Starter #3
pinouts for light module in RH footwell

<H1>A3, X38


RH side of RH footwell
<TABLE class=legendtable cellSpacing=0 cellPadding=5 border=1> <TBODY> <TR> <TD class=legendname>A3</TD> <TD class=legendexplanation>Light module</TD></TR> <TR> <TD class=legendname>X38</TD> <TD class=legendexplanation>Component connector (15 -pin, White), Light module</TD></TR></TBODY></TABLE></H1>



A3 Light module

Connector overview

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=70> <COL width=70> <COL width=311></COLGROUP> <TBODY> <TR> <TH>Number</TH> <TH>X-pin, color</TH> <TH>Description</TH></TR> <TR> <TD>X12</TD> <TD>15-pin, black</TD> <TD>Connector Light module</TD></TR> <TR> <TD>X38</TD> <TD>15-pin, white</TD> <TD>Connector Light module</TD></TR> <TR> <TD>X10117</TD> <TD>54-pin, black</TD> <TD>Connector Light module</TD></TR></TBODY></TABLE>
Pin assignments at connector X12

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=34> <COL width=34> <COL width=187> <COL width=198></COLGROUP> <TBODY> <TR> <TH>Pin</TH> <TH>Type</TH> <TH>Description / Signal type</TH> <TH>Connection /
Measuring notes</TH></TR> <TR class=pinrow1> <TD>1</TD> <TD>A</TD> <TD>Right rear fog light</TD> <TD>Tail light I right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>2</TD> <TD>A</TD> <TD>Left tail light</TD> <TD>Tail light I left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>3</TD> <TD>A</TD> <TD>Right front turn light</TD> <TD>Right front turn signal lamp</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>4</TD> <TD>A</TD> <TD>Right fog light</TD> <TD>Right fog light</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>5</TD> <TD>A</TD> <TD>Left license plate light</TD> <TD>Left license plate light</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>6</TD> <TD>A</TD> <TD>Right front turn light</TD> <TD>Right front turn signal lamp</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>7</TD> <TD>M</TD> <TD>Control module ground</TD> <TD>Ground point</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>8</TD> <TD>A</TD> <TD>Rear left turn light</TD> <TD>Tail light I left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>9</TD> <TD>A</TD> <TD>Left brake light</TD> <TD>Tail light I left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>10</TD> <TD>A</TD> <TD>Center brake light</TD> <TD>High level stop light</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>11</TD> <TD>A</TD> <TD>Left low beam light</TD> <TD>Low beam light, left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>12</TD> <TD>A</TD> <TD>Right license plate light</TD> <TD>Right license plate light</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>13</TD> <TD>A</TD> <TD>Right high beam light</TD> <TD>Right high beam</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>14</TD> <TD>A</TD> <TD>Right front turn light</TD> <TD>Right front auxiliary turn light</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>15</TD> <TD>E</TD> <TD>Terminal 30 voltage supply</TD> <TD>Fuse F112</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR></TBODY></TABLE>
Pin assignments at connector X38

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=34> <COL width=34> <COL width=187> <COL width=198></COLGROUP> <TBODY> <TR> <TH>Pin</TH> <TH>Type</TH> <TH>Description / Signal type</TH> <TH>Connection /
Measuring notes</TH></TR> <TR class=pinrow1> <TD>1</TD> <TD>A</TD> <TD>Nighttime illumination signal line</TD> <TD>Terminal 58 splice</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>2</TD> <TD>M</TD> <TD>Control module ground</TD> <TD>Ground splice</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>3</TD> <TD>A</TD> <TD>Right low beam light</TD> <TD>Low beam light, right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>4</TD> <TD>A</TD> <TD>Left front turn light Tyre pressure control</TD> <TD>Left front auxiliary turn light</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>5</TD> <TD>A</TD> <TD>Left tail light</TD> <TD>Tail light I left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>6</TD> <TD>A</TD> <TD>Left high beam light</TD> <TD>Left high beam</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>7</TD> <TD>A</TD> <TD>Left fog light</TD> <TD>Left fog light</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>8</TD> <TD>E</TD> <TD>Terminal 30 voltage supply</TD> <TD>Fuse F113</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>9</TD> <TD>A</TD> <TD>Left back-up light</TD> <TD>Tail light I left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>10</TD> <TD>A</TD> <TD>Right back-up light</TD> <TD>Tail light I right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>11</TD> <TD>A</TD> <TD>Left front turn light</TD> <TD>Left front turn signal lamp</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>12</TD> <TD>A</TD> <TD>LH rear turn light</TD> <TD>Tail light I right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>13</TD> <TD>A</TD> <TD>Right tail light</TD> <TD>Tail light I right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>14</TD> <TD>A</TD> <TD>Right brake light</TD> <TD>Tail light I right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>15</TD> <TD>A</TD> <TD>Left rear fog light</TD> <TD>Tail light I left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR></TBODY></TABLE>
Pin assignments at connector X10117

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=34> <COL width=34> <COL width=187> <COL width=198></COLGROUP> <TBODY> <TR> <TH>Pin</TH> <TH>Type</TH> <TH>Description / Signal type</TH> <TH>Connection /
Measuring notes</TH></TR> <TR class=pinrow1> <TD>1</TD> <TD>A</TD> <TD>Illumination switch</TD> <TD>Light switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>2</TD> <TD>A</TD> <TD>Signal, headlight vertical aim control</TD> <TD>Actuator for headlight beam throw control, left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>3</TD> <TD>A</TD> <TD>Signal, headlight vertical aim control</TD> <TD>Actuator for headlight beam throw control, left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>4</TD> <TD>A</TD> <TD>Signal, headlight vertical aim control</TD> <TD>Actuator for headlight beam throw control, left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>5</TD> <TD>A</TD> <TD>Signal, headlight vertical aim control</TD> <TD>Actuator for headlight beam throw control, left</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>6</TD> <TD>E</TD> <TD>Seat belt signal</TD> <TD>Driver's air bag</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>7</TD> <TD>E</TD> <TD>Hazard lights ON signal</TD> <TD>Hazard warning flasher switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>8</TD> <TD>E</TD> <TD>Rear fog light ON signal</TD> <TD>Fog light switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>9</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>10</TD> <TD>E</TD> <TD>Washer fluid level</TD> <TD>Washer fluid level switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>11</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>12</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>13</TD> <TD>E</TD> <TD>Voltage supply terminal R</TD> <TD>Fuse F41</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>14</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>15</TD> <TD>E</TD> <TD>Oil level - thermal</TD> <TD>Engine control module (DME) DDE control module Digital diesel electronics control unit</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>16</TD> <TD>E</TD> <TD>Dimmer signal</TD> <TD>Dimmer</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>17</TD> <TD>A</TD> <TD>Right tail light</TD> <TD>Tail light I right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>18</TD> <TD>A</TD> <TD>LH front park light</TD> <TD>Left front turn signal lamp</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>19</TD> <TD>A</TD> <TD>Hazard switch illumination</TD> <TD>Hazard warning flasher switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>20</TD> <TD>A</TD> <TD>Signal, headlight vertical aim control</TD> <TD>Actuator for headlight beam throw control, right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>21</TD> <TD>A</TD> <TD>Signal, headlight vertical aim control</TD> <TD>Actuator for headlight beam throw control, right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>22</TD> <TD>A</TD> <TD>Signal, headlight vertical aim control</TD> <TD>Actuator for headlight beam throw control, right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>23</TD> <TD>A</TD> <TD>Signal, headlight vertical aim control</TD> <TD>Actuator for headlight beam throw control, right</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>24</TD> <TD>E</TD> <TD>Engine coolant level</TD> <TD>Engine coolant level switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>25</TD> <TD>E</TD> <TD>Brake light signal</TD> <TD>Brake light switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>26</TD> <TD>A</TD> <TD>Back up signal</TD> <TD>Chime module, Japan</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>27</TD> <TD>A</TD> <TD>Headlight widening control module power</TD> <TD>Headlight widening control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>28</TD> <TD>A</TD> <TD>Back up signal</TD> <TD>Intermittent wipe/wash control unit, rear</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>29</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>30</TD> <TD>E</TD> <TD>Signal Turn light</TD> <TD>Combination switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>31</TD> <TD>E</TD> <TD>Terminal 15</TD> <TD>Fuse F16</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>32</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>33</TD> <TD>E</TD> <TD>Headlights ON signal</TD> <TD>Light switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>34</TD> <TD>E</TD> <TD>Signal Headlight widening adjustment</TD> <TD>Headlight widening potentiometer</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>35</TD> <TD>A</TD> <TD>Interface AHM/LM</TD> <TD>Trailer module (AHM)</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>36</TD> <TD>E/A</TD> <TD>I/K-bus signal link</TD> <TD>Connector, I/K-bus</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>37</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>38</TD> <TD>E</TD> <TD>Back up signal</TD> <TD>Navigation control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>39</TD> <TD>E</TD> <TD>Back up signal</TD> <TD>Electrochromic rear view mirror</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>40</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>41</TD> <TD>E</TD> <TD>Brake fluid level</TD> <TD>Brake fluid level switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>42</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>43</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>44</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>45</TD> <TD>E</TD> <TD>Rear fog light ON signal</TD> <TD>Fog light switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>46</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>47</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>48</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>49</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>50</TD> <TD>E</TD> <TD>Signal High beam, headlight flash switch</TD> <TD>Combination switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>51</TD> <TD>E</TD> <TD>Park light ON signal</TD> <TD>Light switch</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>52</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>53</TD> <TD>E</TD> <TD>Signal Headlight widening adjustment</TD> <TD>Headlight widening potentiometer</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>54</TD> <TD>A</TD> <TD>Terminal 58 illumination</TD> <TD>Electronic shock absorber control module (EDC)</TD></TR></TBODY></TABLE>
 

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111 Posts
Discussion Starter #4
Think I got it

<H1> <H1> <H1>X18801 Component connector (12-pin, blue)


Matching adapter: 61 4 480
</H1>

A196, X18801


center console
<TABLE class=legendtable cellSpacing=0 cellPadding=5 border=1> <TBODY> <TR> <TD class=legendname>A196</TD> <TD class=legendexplanation>On-board monitor</TD></TR> <TR> <TD class=legendname>X18801</TD> <TD class=legendexplanation>Component connector (12-pin, blue), On-board monitor</TD></TR></TBODY></TABLE></H1>

X18802


center console
<TABLE class=legendtable cellSpacing=0 cellPadding=5 border=1> <TBODY> <TR> <TD class=legendname>X18802</TD> <TD class=legendexplanation>Component connector (12-pin, white), On-board monitor</TD></TR></TBODY></TABLE></H1> <H1>A196 On-board monitor

Connector overview

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=70> <COL width=70> <COL width=311></COLGROUP> <TBODY> <TR> <TH>Number</TH> <TH>X-pin, color</TH> <TH>Description</TH></TR> <TR> <TD>X18801</TD> <TD>12-pin, blue</TD> <TD>Connector On-board monitor</TD></TR> <TR> <TD>X18802</TD> <TD>12-pin, blue</TD> <TD>Connector On-board monitor</TD></TR></TBODY></TABLE> Pin assignments at connector X18801

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=34> <COL width=34> <COL width=187> <COL width=198></COLGROUP> <TBODY> <TR> <TH>Pin</TH> <TH>Type</TH> <TH>Description / Signal type</TH> <TH>Connection /
Measuring notes</TH></TR> <TR class=pinrow1> <TD>1</TD> <TD>E</TD> <TD>Nighttime illumination signal</TD> <TD>Light module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>2</TD> <TD>M</TD> <TD>Ground</TD> <TD>Ground point</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>3</TD> <TD>A</TD> <TD>Left tape voltage control</TD> <TD>Radio</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>4</TD> <TD>A</TD> <TD>Left tape ground control</TD> <TD>Radio</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>5</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>6</TD> <TD>E/A</TD> <TD>I/K-bus signal link</TD> <TD>Connector, I/K-bus</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>7</TD> <TD>E</TD> <TD>Terminal 30</TD> <TD>Fuse F56</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>8</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>9</TD> <TD>A</TD> <TD>Right tape ground control</TD> <TD>Radio</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>10</TD> <TD>A</TD> <TD>Right tape voltage control</TD> <TD>Radio</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>11</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>12</TD> <TD>E/A</TD> <TD>Background illumination signal</TD> <TD>On-board monitor</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR></TBODY></TABLE> Pin assignments at connector X18802

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=34> <COL width=34> <COL width=187> <COL width=198></COLGROUP> <TBODY> <TR> <TH>Pin</TH> <TH>Type</TH> <TH>Description / Signal type</TH> <TH>Connection /
Measuring notes</TH></TR> <TR class=pinrow1> <TD>1</TD> <TD>A</TD> <TD>Navigation video signal, red</TD> <TD>Navigation control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>2</TD> <TD>M</TD> <TD>Navigation video signal, red Ground</TD> <TD>Navigation control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>3</TD> <TD>A</TD> <TD>Navigation video signal, green</TD> <TD>Navigation control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>4</TD> <TD>M</TD> <TD>Navigation video signal, green Ground</TD> <TD>Navigation control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>5</TD> <TD>A</TD> <TD>Navigation video signal, blue</TD> <TD>Navigation control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>6</TD> <TD>M</TD> <TD>Navigation video signal, blue Ground</TD> <TD>Navigation control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>7</TD> <TD>A</TD> <TD>Video module ground signal</TD> <TD>Navigation control module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>8</TD> <TD>E</TD> <TD>Terminal 30</TD> <TD>Fuse F56</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>9</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>10</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>11</TD> <TD> </TD> <TD>Not used</TD> <TD> </TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>12</TD> <TD>E/A</TD> <TD>Background illumination signal</TD> <TD>On-board monitor</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR></TBODY></TABLE></H1> S8, X503


LH side of dash
<TABLE class=legendtable cellSpacing=0 cellPadding=5 border=1> <TBODY> <TR> <TD class=legendname>S8</TD> <TD class=legendexplanation>Light switch</TD></TR> <TR> <TD class=legendname>X503</TD> <TD class=legendexplanation>Component connector (4 -pin, Black), Light switch</TD></TR></TBODY></TABLE>

S8 Light switch

Connector overview

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=70> <COL width=70> <COL width=311></COLGROUP> <TBODY> <TR> <TH>Number</TH> <TH>X-pin, color</TH> <TH>Description</TH></TR> <TR> <TD>X503</TD> <TD>4-pin, Black</TD> <TD>Connector Light switch</TD></TR></TBODY></TABLE>
Pin assignments at connector X503

<TABLE cellSpacing=0 cellPadding=5 border=1> <COLGROUP> <COL width=34> <COL width=34> <COL width=187> <COL width=198></COLGROUP> <TBODY> <TR> <TH>Pin</TH> <TH>Type</TH> <TH>Description / Signal type</TH> <TH>Connection /
Measuring notes</TH></TR> <TR class=pinrow1> <TD>1</TD> <TD>M</TD> <TD>Ground</TD> <TD>Ground splice</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>2</TD> <TD>E</TD> <TD>Illumination switch</TD> <TD>Light module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>3</TD> <TD>A</TD> <TD>Park light ON signal</TD> <TD>Light module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR> <TR class=pinrow1> <TD>4</TD> <TD>A</TD> <TD>Headlights ON signal</TD> <TD>Light module</TD></TR> <TR class=pinrow2> <TD colSpan=2> </TD> <TD> </TD> <TD> </TD></TR></TBODY></TABLE>


R13, X10051


LH side of dash
<TABLE class=legendtable cellSpacing=0 cellPadding=5 border=1> <TBODY> <TR> <TD class=legendname>R13</TD> <TD class=legendexplanation>Headlight widening potentiometer</TD></TR> <TR> <TD class=legendname>X10051</TD> <TD class=legendexplanation>Component connector (3-pin, Black), Headlight widening potentiometer</TD></TR></TBODY></TABLE>
 

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Discussion Starter #5 (Edited)
So it looks like Pin 12 of connecter X18801 is the background illumination signal. And from my tests, on that pin, I have no voltage reading. This is starting to make some sense. But how do I trace what this wire is connected to now? From the wiring diagram for Component On-board monitor A196 it looks like the pin 12 from both X18801 and X18802 are just connected together but that cannot be right.

Sailor, help, I'm lost again!
 

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Discussion Starter #6
A196 diagram

The attached image is the diagram I am referring to. Pin 12 seems to connect to the other Pin 12 on the other connector. That just doesn't make sense to me. Also, not sure what kind of signal "PL" is.
 

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Hi,

A good way to continue fault finding is to find a 100% known working Mk4 GPS computer and Monitor and swap those in. If they 'work' then you know you still have a faulty monitor and/or GPS computer. Swap each of those with the known working units to see if it's one or indeed both your unit's that are faulty.

If they 'don't' work, then you do indeed have an issue elsewhere. It could be the wiring and if so, you'll need to trace each of the wire(s) back to see if there's a break or chafe somewhere along it.

It 'might' be a fault with one of the other modules - amplfier/tuner module, CD changer although I doubt it. I'm just thinking that if one of those other elements is faulty, it 'might' be sending out a spurious signal that's causing the issue further along the line..

Happy testing!

Cheers, Dennis!
 
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