Diagnostic Test

1) TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

Clear all TIPM DTC's.

Turn the Left Turn Signal on.

With the scan tool, read DTC's.

Does the scan tool read: B1644-REAR LEFT TURN CONTROL CIRCUIT HIGH?

Yes
1. Go to Step 2.
No
1. The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
2. Perform the BODY VERIFICATION TEST - VER 1 .
2) LEFT REAR TURN SIGNAL BULB
Turn the ignition off.

Inspect the Left Rear Turn Signal Bulb Assembly.

Is the inoperative bulb OK?

Yes
1. Go to Step 3.
No
1. Replace the Inoperative bulb in accordance with the service information.
2. Perform the BODY VERIFICATION TEST - VER 1 .
3) (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT OPEN
Turn the ignition off.

Disconnect the TIPM C3 harness connector.

Disconnect the Left Rear Tail Lamp harness connector.

Measure the resistance of the (L63) Left Rear Turn Signal Control circuit.

Is the resistance above 5.0 ohms?

Yes
1. Repair the (L63) Turn Signal Control circuit for an open.
2. Perform the BODY VERIFICATION TEST - VER 1 .
No
1. Go to Step 4.
4) (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT SHORTED TO VOLTAGE
Turn the ignition on.

Measure for voltage on the (L63) Left Rear Turn Signal Control circuit.

Is there any voltage present?

Yes
1. Repair short to voltage on the (L63) Left Rear Turn Signal Control circuit.
2. Perform the BODY VERIFICATION TEST - VER 1 .
No
1. Replace the Totally Integrated Power Module (TIPM) in accordance with the service information.
2. Perform the BODY VERIFICATION TEST - VER 1 .