Checking the Relay Power Supply

Checking the Relay Power Supply







- Remove component: Relay for electrically heated rear window







- Turn the ignition switch to the ON position.


















- Connect test lamp 86 11 857 to pin 4 (86) of the relay holder and a good grounding point.







- The test lamp should light.

Checking the Wiring Harness
Jiggle the leads and in-line connectors at several places and in different directions to several intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.

Is the function correct?

NO - Rectifying the Lead - I

YES - Checking the Control Module's Output to the Relay