PINPOINT TEST N : The Liftgate Trunk Module (LTM) Does Not Respond To The Scan Tool
NOTE:
Failure to disconnect the battery when instructed will result in false resistance readings. REFER to Battery, Mounting and Cables
- N1 CHECK THE LTM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN
- Ignition OFF.
- Disconnect: LTM C4174A.
- Ignition ON.
Are the voltages greater than 11 volts?
Yes GO to N2. No VERIFY the BJB fuse 7 (30A) and the BCM fuse 9 (10A) is OK. If OK, REPAIR the circuit in question. If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short. - N2 CHECK THE LTM GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure:
Positive Lead Measurement / Action Negative Lead C4174A-1 Ground
Is the resistance less than 3 ohms?
Yes GO to N3. No REPAIR the circuit. - N3 CHECK THE MS-CAN CIRCUITS BETWEEN THE LTM AND THE DLC FOR AN OPEN
- Disconnect: LTM C4174B.
Are the resistances less than 3 ohms?
Yes CONNECT the negative battery cable. GO to N4. No REPAIR the circuit in question. - N4 CHECK FOR CORRECT LTM OPERATION
- Ignition OFF.
- Disconnect and inspect the LTM connectors and related in-line connectors.
- Repair:
- corrosion (replace connector or terminals - clean module pins)
- damaged or bent pins - replace terminals/pins
- pushed-out pins - replace pins as necessary
- Reconnect the LTM connectors and related in-line connectors. Make sure they seat and latch correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any applicable TSBs. If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no TSBs address this concern, INSTALL a new LTM. REFER to Body Closures . No The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
