Pinpoint Test H: DTC B117C

Power Liftgate

Pinpoint Test H: DTC B117C

Normal Operation

The Liftgate/Trunk Module (LTM) monitors the sector gear switches to determine the position of the sector gear inside the liftgate latch during cinching and releasing.

- DTC B117C (Latch Centering Switch Invalid)- an on-demand DTC that sets when the LTM (Liftgate/Trunk Module) detects the sector gear open/close switch(es) are not in the correct state at the beginning of self-test, or no sector gear switch transition during releasing/cinching.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- Power liftgate latch

- LTM (Liftgate/Trunk Module)

PINPOINT TEST H : DTC B117C

NOTICE: Use the correct probe adapter(s) from the Flex Probe Kit when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

H1 RETRIEVE THE DTCs FROM THE LTM (Liftgate/Trunk Module)

- Use the recorded Liftgate/Trunk Module (LTM) DTCs from the self-test.

Is DTC B117C the only DTC present?

Yes
GO to H2.

No
DIAGNOSE all other LTM (Liftgate/Trunk Module) DTCs first. REFER to the Liftgate/Trunk Module (LTM) DTC Chart Trunk / Liftgate.

H2 CHECK THE SECTOR GEAR SWITCH INPUT CIRCUITS FOR VOLTAGE

- Disconnect: Power Liftgate Latch C4339.

- Ignition ON.

- Measure the voltage between power liftgate latch assembly C4339-6, circuit CPR67 (VT), harness side and ground; and between C4339-7, circuit CPR68 (YE), harness side and ground.






Are the voltages greater than 10 volts?

Yes
INSTALL a new power liftgate latch. CLEAR the DTCs. REPEAT the LTM (Liftgate/Trunk Module) self-test.

If DTC B117C returns, GO to H5.

No
GO to H3.

H3 CHECK THE SECTOR GEAR SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: LTM (Liftgate/Trunk Module) C4174B.

- Measure the resistance between LTM (Liftgate/Trunk Module) C4174B-2, circuit CPR67 (VT), harness side and ground; and between LTM (Liftgate/Trunk Module) C4174B-13, circuit CPR68 (YE), harness side and ground.






Are the resistances greater than 10,000 ohms?

Yes
GO to H4.

No
REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the LTM (Liftgate/Trunk Module) self-test.

H4 CHECK THE SECTOR GEAR SWITCH INPUT CIRCUITS FOR AN OPEN

- Measure the resistance between LTM (Liftgate/Trunk Module) C4174B, harness side and power liftgate latch C4339, harness side using the following chart:

LTM (Liftgate/Trunk Module) Connector-Pin Circuit Power Liftgate Latch Connector-Pin C4174B-2 CPR67 (VT) C4339-6 C4174B-13 CPR68 (YE) C4339-7





Are the resistances less than 5 ohms?

Yes
INSTALL a new power liftgate latch. CLEAR the DTCs. REPEAT the LTM (Liftgate/Trunk Module) self-test.

IF DTC B117C returns, GO to H5.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the LTM (Liftgate/Trunk Module) self-test.

H5 CHECK FOR CORRECT LTM (Liftgate/Trunk Module) OPERATION

- Disconnect all the LTM (Liftgate/Trunk Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the LTM (Liftgate/Trunk Module) connectors and make sure they are seated correctly.

- Make sure the liftgate is fully closed.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new LTM (Liftgate/Trunk Module). REFER to Liftgate/Trunk Module (LTM) Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.