DME 7.8 DME 7.8 0 · 0-190P1574

DME 7.8 DME 7.8 0 0-190P1574 364 Stop light switch - signal implausible Diagnosis conditions • Ignition on Possible fault cause ♦Stop light switch ♦Wiring harness Note! The DME control module receives the signals from the stop light switches via CAN bus. Affected terminals Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check stop light switch ♦Remove stop light switch 0 - 5 Ω Replace stop light switch ♦Measure resistance between Pin → End 1 and Pin 4 ♦Actuate stop light switch ∞ Ω ♦Measure resistance between Pin ∞ Ω 1 and Pin 2 ♦Actuate stop light switch 0 - 5 Ω ♦Install stop light switch ⇒ Step 2 2 Check wiring from PSM ♦Remove PSM control module 0 V Repair wiring har- control module to stop connector ness light switch 1 for short cir- → End ♦Measure voltage between Pin 32 cuit to B+ and ground ♦Switch on the ignition ♦Actuate brake Battery voltage ⇒ Step 3 9436 P1574 0-190 page 1 Printed in Germany, 2000 p1574