DME 7.8 DME 7.80 · ♦If all CAN bus faults are stored, there is a short circuit in the CAN

DME 7.8 DME 7.80 Note! ♦If all CAN bus faults are stored, there is a short circuit in the CAN bus wiring ♦If one CAN bus fault is stored, the cruise control system is out of order. ♦CAN bus faults may be caused by a control module reset. The fault is then indicated as "Not present". Affected terminals Terminal I/15 and I/31 Diagnosis/Troubleshooting Work instruction Display OK If not OK 1 Check whether connector of instrument cluster is plugged in Step 2 2 Check CAN bus from DME ♦Remove DME control module Repair wiring har- control module to instru- connector ness ment cluster for continuity → End. ♦Remove plug I from instrument cluster ♦Remove PSM control module connector ♦Connect special tool 9637 to wiring harness (DME control module plug) ♦Measure resistance between 0 - 5 Ω special tool 9637 plug IV pin 36 and instrument cluster plug I pin 15 ♦Measure resistance between 0 - 5 Ω special tool plug IV pin 37 and Step 3 instrument cluster plug I pin 31 3 Check CAN bus from DME ♦Remove DME control module Repair wiring har- control module to instru- connector ness ment cluster for short cir- → End. ♦Remove plug I from instrument cuit to ground cluster ♦Remove PSM control module connector ♦Remove plug of steering angle sensor ♦Connect special tool 9637 to wiring harness (DME control module plug) 0-196 page 2 P1601 p1601 Printed in Germany – 8, 2002