B1644

B1644-REAR LEFT TURN LAMP CONTROL CIRCUIT HIGH

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

- When Monitored:
With the turn signal active.

- Set Condition:
When the Totally Integrated Power Module (TIPM) detects a high condition.





Diagnostic Test

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

Does the scan tool display active: B1644-REAR LEFT TURN LAMP CONTROL CIRCUIT HIGH?

Yes

- Go To 2

No

- The condition that caused this symptom is currently not present. Check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals. Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

2. CHECK THE (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
1. Turn the Left Turn Signal off.
2. Turn the ignition off.
3. Disconnect the Left Tail Lamp Assembly harness connector.
4. Disconnect the TIPM C7 harness connector.
5. Turn the ignition on.
6. Measure the voltage between ground and the (L63) Left Rear Turn Signal Control circuit.

Is there any voltage present?

Yes

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

No

- Go To 3

3. CHECK THE TIPM FOR CORRECT OPERATION
1. Turn the ignition off.
2. Reconnect the TIPM C7 harness connector.
3. Connect a 12-volt test light between the (L63) Left Rear Turn Signal Control circuit and the (Z910) Ground circuit at the Left Tail Lamp Assembly harness connector.
4. Turn the ignition on.
5. Turn the Left Turn Signal on.

Does the test light blink on and off?

Yes

- Replace the Turn Signal Bulb/Lamp.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

No

- Go To 4

4. CHECK THE (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT FOR AN OPEN IN THE HARNESS
1. Turn the ignition off.
2. Disconnect the TIPM C7 harness connector.
3. Measure the resistance of the (L63) Left Rear Turn Signal Control circuit between the Left Tail Lamp Assembly harness connector and the TIPM C7 harness connector.

Is the resistance below 5.0 Ohms?

Yes

- Go To 5

No

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

5. CHECK THE (Z910) GROUND CIRCUIT FOR AN OPEN IN THE HARNESS
1. Using a 12-volt test light connected to 12-volts, check the (Z910) Ground circuit.

Does the test light illuminate brightly?

Yes

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

No

- Repair the open in the (Z910) Ground circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.