Pinpoint Test

1. Ignition ON.
2. Using a scan tool, perform the LTM self-test.
3. Using a scan tool, clear the LTM DTCs  .
4. Wait 10 seconds.
5. Repeat the LTM self-test.

Is DTC B1318 still present? 

1. Yes: GO to 2  .
2. No: The system is operating correctly at this time. The DTC may have been set due to a previous low battery voltage condition.

1. Using a scan tool, perform the PCM KOEO self-test.

Are any charging system DTCs set in the PCM? 

1. Yes: REFER to DTC INDEX - Powertrain Control Module (PCM).
2. No: GO to 3  .

1. Check the battery condition and verify the battery is fully charged. REFER to DIAGNOSTIC ROUTINE A : Battery Condition Test.

Is the battery OK and fully charged? 

1. Yes: GO to 4  .
2. No: CHARGE or INSTALL a new battery as necessary. REFER to BATTERY CHARGING , and BATTERY - Removal and Installation .

1. Ignition ON.
2. Measure and record the voltage at the battery.
3. Using a scan tool, view LTM PIDs  .
4. Monitor the LTM voltage PIDs  (VBAT_#1) and (VBAT_#2).

Are the PID voltages within 0.2 volt of the recorded battery voltage? 

1. Yes: GO to  7.
2. No: GO to 5  .

1. Ignition OFF.
2. Disconnect: LTM C4174A.
3. Measure:

   LTM			Ground
   C4174A			Ground
   Pin	Circuit	Measurement / Action	Pin	Circuit
   4	SBB07 (WH/RD)		-	Ground
   9	SBP09 (RD)		-	Ground

Are the voltages within 0.2 volt of the recorded battery voltage? 

1. Yes: GO to 6  .
2. No: REPAIR the circuit in question for high resistance.

1. Measure:

   LTM			Ground
   C4174A			Ground
   Pin	Circuit	Measurement / Action	Pin	Circuit
   1	GD349 (BK/GY)		-	Ground

Is the resistance less than 3 ohms? 

1. Yes: GO to 7  .
2. No: REPAIR the circuit for high resistance.

1. Ignition OFF.
2. Disconnect and inspect all LTM 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 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? 

1. 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 Liftgate/Trunk Module (LTM) .
2. No: The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.