Diagnostic Routine J

Diagnostic Routine J

Diagnostic Overview

B117C

Refer to Wiring Diagram Set 109 for schematic and connector information Electrical Diagrams.

Normal Operations and Fault Conditions

When the power liftgate moves in the close direction, the LTM (Liftgate/Trunk Module) monitors the sector gear switches to determine the position of the sector gear inside the liftgate latch during cinching and releasing. The unlatch/cinch motor in the liftgate latch rotates the sector gear in either direction depending upon if it unlatching or cinching. Once the latch is unlatched or cinched, the LTM (Liftgate/Trunk Module) powers the unlatch/cinch motor so that the sector gear is in a centered state.

DTC Fault Trigger Conditions

Pinpoint Test

1. RETRIEVE THE DTCs (Diagnostic Trouble Codes) FROM THE LTM (Liftgate/Trunk Module)

1. Using a scan tool, perform the LTM (Liftgate/Trunk Module) self-test.

Is DTC (Diagnostic Trouble Code) B117C the only DTC (Diagnostic Trouble Code) present?

2. CHECK THE SECTOR GEAR SWITCH INPUT CIRCUITS FOR VOLTAGE

1. Disconnect: Power Liftgate Latch.

2. Ignition ON.

3. Measure:

Are the voltages greater than 11 volts?

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

1. Ignition OFF.

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

3. Measure:

Are the resistances greater than 10,000 ohms?

4. CHECK THE SECTOR GEAR SWITCH INPUT CIRCUITS FOR AN OPEN

1. Measure:

Are the resistances less than 3 ohms?

5. CHECK FOR CORRECT LTM (Liftgate/Trunk Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all LTM (Liftgate/Trunk Module) connectors.

3. Repair:

- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

4. Reconnect all the LTM (Liftgate/Trunk Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?