B17C5

B17C5-12-TRAILER TOW REVERSE LAMP CONTROL - CIRCUIT SHORT TO BATTERY

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





Theory of Operation

Four relays are used to provide voltage to the Trailer Tow connector. The trailer tow relays are used to switch fused battery voltage directly to the Trailer Tow connector when requested. The trailer tow relays are activated through a ground path provided by the Body Control Module (BCM).

- When Monitored:
With the ignition on, turn signal active.

- Set Condition:
The Body Control Module (BCM) detects a short to voltage on the Trailer Reverse Lamp Control circuit.





Diagnostic Test

1. VERIFY THE DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, read DTCs.

Does the scan tool display this DTC as active?

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 (L658) TRAILER REVERSE LAMP CONTROL CIRCUIT FOR A SHORT TO VOLTAGE IN THE HARNESS
1. Turn the ignition off.
2. Disconnect the PDC C7 harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (L658) Trailer Reverse Lamp Control circuit at the PDC C7 harness connector.

Is there any voltage present?

Yes

- Using the wiring diagrams as a guide, repair the short to voltage in the (L658) Trailer Reverse Lamp Control circuit.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Go To 3

3. INSPECT RELATED WIRING AND CHECK FOR TSBS
1. Turn the ignition off.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the PDC and the BCM.
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals.
5. Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

- Repair as necessary.
- Perform the BODY VERIFICATION TEST. Body Verification Test .

No

- Replace the BCM. Body Control Module - Removal.
- Perform the BODY VERIFICATION TEST. Body Verification Test .