Checking Components And Wiring, No Fault Detected

Check central electronic module (CEM) connector C. Check for contact resistance and oxidation. Check for damage in particular.

Check the connector on the back-up (reversing) lamp switch. Check for contact resistance and oxidation. Check for damage in particular.

Check the cable between the central electronic module (CEM) and the back-up (reversing) lamp switch. Check for an open-circuit. Check for an intermittent short-circuit to ground.

Take readings between:

• Central electronic module (CEM) terminal #C34 (34) and back-up (reversing) lamp switch terminal #1 (3/10).

Other information 

• See Connecting the breakout box
• See Signal specification
• See Back-up lamp switch, replacing
• For M56 and M58 2001- see Back-up lamp switch, replacing
• For M66AWD 2004-, see Back-up lamp switch, replacing .
• See Contents

• Continue 

  Refer to Verification