Diagnostic Test

1) (W12) REAR WIPER RELAY CONTROL CIRCUIT OPEN
NOTE: Check all applicable fuses prior to testing.

Disconnect the TIPM C3 connector.

Measure the resistance of the (W12) Rear Wiper Relay Control circuit between the TIPM and the Rear Wiper Relay.

Is the resistance below 5.0 ohms?

Yes
1. Repair the (W12) Rear Wiper Relay Control circuit for an open condition.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go to 2).
2) INTEGRATED POWER MODULE
Turn the ignition off.

Replace the Rear Wiper relay with a known good relay.

With the Scan Tool, clear all TIPM DTC's.

Turn the Wipers ON then OFF.

With the Scan Tool, read the TIPM DTC's.

Does the Scan Tool read: B231D-REAR WIPER MOTOR CONTROL CIRCUIT OPEN?

Yes
1. Replace the Totally Integrated Power Module in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Rear Wiper Relay in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .