B1644

B1644-REAR LEFT TURN LAMP CONTROL CIRCUIT HIGH







- When Monitored:
Continuously.

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





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

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 - VER 1. Body Verification Test

2. CHECK (Z910) GROUND CIRCUITS
1. Turn the ignition off.
2. Disconnect the Left Rear Turn Signal Lamp assembly harness connector.
3. With a 12-volt test light connected to 12-volts, probe each (Z910) Ground circuit.

Does the test light illuminate brightly on each ground circuit?

Yes

- Go To 4

No

- Go To 3

3. (Z910) GROUND CIRCUIT OPEN
1. Measure the resistance of the appropriate (Z910) Ground circuit(s) at the Left Rear Turn Signal Lamp assembly harness connector.

Is the resistance below 10.0 ohms?

Yes

- Replace the Inoperative bulb.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Repair the appropriate (Z910) Ground circuit(s) for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

4. CHECK (L63) LEFT REAR TURN SIGNAL CONTROL CIRCUIT
1. Turn the ignition on.
2. With the Left Turn Signal still on and a 12-volt test light connected to ground, check the (L63) Left Rear Turn Signal Control circuit.

Does the test light blink brightly from on to off with the turn signal indicator?

Yes

- Replace the Inoperative bulb.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

No

- Go To 5

5. (L63) LEFT TURN SIGNAL CONTROL CIRCUIT OPEN
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 Rear Tail Lamp assembly harness connector and the TIPM C7 harness connector.

Is the resistance below 10.0 ohms?

Yes

- Go To 6

No

- Repair the (L63) Left Rear Turn Signal Control circuit for an open.
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test

6. (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 - VER 1. Body Verification Test

No

- Replace the Totally Integrated Power Module (TIPM).
- Perform the BODY VERIFICATION TEST - VER 1. Body Verification Test