DME 7.8 DME 7.8 0 · 0-88.3P0645

DME 7.8 DME 7.8 0 0-88.3P0645 A/C Compressor Control – Open Circuit Diagnosis conditions • Engine running • Battery positive voltage greater than 7 V • Air conditioning on Possible fault cause ♦A/C relay ♦Open circuit in wiring Affected terminals Terminal IV/27 Diagnosis/Troubleshooting Work instruction Display OK If not OK 1 Check A/C relay ♦Remove A/C relay Approx. 75 Ω Replace A/C relay Step 2 → End ♦Measure resistance between Pin 85 and Pin 86 2 Check control wire for A/ ♦Remove A/C relay 0 - 5 Ω Repair wiring har- C relay, Pin 2 (terminal → End. ness ♦Connect special tool 9637 to 85), for open circuit → End. wiring harness (DME control module plug). ♦Measure resistance between special tool 9637 Pin IV/27 and A/C relay plug Pin 2 8728 P0645 0-88.3 page 1 Printed in Germany – 6, 2002 p0645