DME 7.8 DME 7.8 0 · 0-168P1455

DME 7.8 DME 7.8 0 0-168P1455 170 A/C compressor control - open circuit Diagnosis conditions • Engine running • Battery 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 P1455 0-168 page 1 Printed in Germany, 2000 p1455