B1643-REAR LEFT TURN LAMP CONTROL CIRCUIT LOW
B1643-REAR LEFT TURN LAMP CONTROL CIRCUIT LOW
For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Totally Integrated Power Module (TIPM) receives a bus message requesting turn signal lamp illumination. When this bus message is received, the TIPM provides a pulsed voltage output through the rear turn signal control circuit. The rear turn signal control circuit connects to the dual filament Park and Turn Signal Bulb in the Lamp, Tail Stop Turn. The same ground circuit is used for both the Park and Turn Signal filaments in a dual filament lamp.
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When Monitored:
With the turn signal active.
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Set Condition:
When the Totally Integrated Power Module (TIPM) detects a low condition on the (L63) Left Rear Turn Lamp Driver circuit.
Possible Causes |
|---|
| (L63) LEFT REAR TURN LAMP DRIVER CIRCUIT SHORTED TO GROUND |
| LEFT REAR TURN SIGNAL BULB |
| TOTALLY INTEGRATED POWER MODULE (TIPM) |
| 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 DTC: B1643-REAR LEFT TURN LAMP CONTROL CIRCUIT LOW?
Yes
- Go To 2
No
- Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
2. ATTEMPT TO SET THE OPPOSITE DTC
| 1. | Turn the Left Turn Signal off. |
| 2. | Turn the ignition off. |
| 3. | Disconnect the Left Tail Lamp Assembly harness connector. |
| 4. | Turn the ignition on. |
| 5. | Turn the Left Turn Signal on. |
| 6. | With the scan tool, read DTCs. |
Does the scan tool display DTC: B1644-REAR LEFT TURN LAMP CONTROL CIRCUIT HIGH?
Yes
- Replace the Left Rear Turn Signal Bulb in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Go To 3
3. CHECK THE (L63) LEFT REAR TURN LAMP DRIVER CIRCUIT FOR A SHORT TO GROUND
| 1. | Turn the ignition off. |
| 2. | Disconnect the TIPM C7 harness connector. |
| 3. | Measure the resistance between ground and the (L63) Left Rear Turn Lamp Driver circuit. |
Is the resistance above 10k Ohms?
Yes
- Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).
No
- Repair the short to ground in the (L63) Left Rear Turn Lamp Driver circuit.
- Perform the BODY VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Totally Integrated Power (TIPM) - Standard Procedure).