B17B2

B17B2-REAR RIGHT TRAILER 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 trailer tow turn signal control circuit. For additional information on the Trailer Tow Wiring operation, Exterior Lamps - Operation.

- When Monitored:
With the turn signal active.

- Set Condition:
When the Totally Integrated Power Module (TIPM) detects a low condition on the (L656) Right Rear Turn Signal Control circuit.





1. TEST FOR INTERMITTENT CONDITION

NOTE: Make sure any aftermarket or trailer tow accessories are disconnected from the Trailer Tow Connector.

1. Turn the ignition on.
2. With the scan tool, clear all DTCs.
3. Turn on the Right Turn Signal.
4. With the scan tool, read DTCs.

Does the scan tool display DTC: B17B2-REAR RIGHT TRAILER 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. Body Verification Test.

2. CHECK THE (L656) RIGHT REAR TURN SIGNAL CONTROL CIRCUIT FOR A SHORT TO GROUND IN THE HARNESS




1. Turn the ignition off.
2. Disconnect the TIPM C7 harness connector.
3. Disconnect the Trailer Tow 7-Way Wiring harness connector.
4. Measure the resistance between ground and the (L656) Right Rear Turn Signal Control circuit.

Is the resistance above 10k Ohms?

Yes

- Go To 3

No

- Repair the short to ground in the (L656) Right Rear Turn Signal Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test.

3. CHECK THE TRAILER TOW CONNECTOR FOR AN INTERNAL SHORT TO GROUND

NOTE: This measurement is taken at the Trailer Tow Connector used by the customer. Use the diagram on the Trailer Tow Connector cover to determine the correct terminal.

1. Reconnect the Trailer Tow 7-Way Wiring harness connector.
2. Measure the resistance between ground and the (L656) Right Rear Turn Signal Control circuit at the appropriate terminal in the Trailer Tow Connector.

Is the resistance above 10k Ohms?

Yes

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

No

- Replace the Trailer Tow Connector. Trailer Tow Connector - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test.