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B1840

Read the instructions below then start the fault diagnostic procedure.

Symptom: Left rear window cannot be operated.

B1840


Window Relay 3, Rear Left. Internal fault.


Fault symptom

Left rear window cannot be operated.

Condition

Internal fault in relay.

Diagnostic procedure

There is communication on the VR-bus as long as there is +54 current. This DTC is generated if response is missing from the relay in question.

The cause of the problem could be power supply, grounding or that bus connection is missing.


- Try moving the relay to the position for the left front window.

- Activate the relay with the button for the left rear window on the centre console.

- Left front window should raise or lower.

- If the left front window raises or lowers, the problem is most likely in the wiring harness


Checking wiring harness

Intermittent faults can exist during temporary short circuits and open circuits. Wiggle the wiring harness at several points and in different directions to discover problems in the wiring harness and connectors. Observe the multimeter, diagnostic tool or the test lamp during checking.