B1644

B1644-REAR LEFT TURN CONTROL CIRCUIT HIGH

For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
Continuously

- Set Condition:
When the Totally Integrated Power Module (TIPM) detects an open or short to battery on the Left Rear Turn Signal Control circuit.





1. TEST FOR INTERMITTENT CONDITION
1. Turn the ignition on.
2. With the scan tool, clear all TIPM DTCs.
3. Turn the Left Turn Signal on.
4. With the scan tool, read DTCs.

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

Yes

- Go To 2

No

- 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.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT OPEN
1. Turn the ignition off.
2. Disconnect the TIPM C3 harness connector.
3. Disconnect the Left Tail Lamp Assembly C1 harness connector.
4. Measure the resistance of the (L63) Left Rear Turn Signal Control circuit.

Is the resistance above 5.0 Ohms?

Yes

- Repair the (L63) Left Turn Signal Control circuit for an open.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 3

3. (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT SHORTED TO VOLTAGE
1. Turn the ignition on.
2. Measure for voltage on the (L63) Left Rear Turn Signal Control circuit.

Is there any voltage present?

Yes

- Repair short to voltage on the (L63) Left Rear Turn Signal Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK THE TIPM FOR CORRECT OPERATION
1. Turn the ignition off.
2. Reconnect the TIPM C3 harness connector.
3. Connect a 12-volt test light between ground and the (L63) Left Rear Turn Signal Control circuit in the Left Tail Lamp Assembly C1 harness connector.
4. Turn the ignition on.
5. Turn the Left Turn Signal on.

Does the test light illuminate brightly?

Yes

- Replace the Left Tail Stop Turn Lamp. Tail Stop Turn Lamp - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Replace the Totally Integrated Power Module (TIPM). Totally Integrated Power Module (TIPM) - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.