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Pinpoint Test

NOTE: The following Pinpoint Test uses a test light to simulate normal circuit loads. Use only the test lamp recommended in the Special Tools table at the beginning of this section or electrical equivalent. To avoid connector terminal damage, use the Rotunda Flex Probe kit for the test light probe connection to the vehicle. Do not use the test lamp probe directly on any connector. See Special Tool(s) .
  1. RETRIEVE THE BCM AND LTM DTCs  FROM THE SELF-TESTS
    1. Using a scan tool, perform the BCM self-test.
    2. Using a scan tool, perform the LTM self-test.

    Are any DTCs  recorded?

  2. REPEAT THE BCM SELF-TEST
    1. Disconnect: Liftgate Release Switch.
    2. Using a scan tool, clear the BCM DTCs  .
    3. Using a scan tool, perform the BCM self-test.

    Is DTC B12E8:11 recorded? 

    • Yes: GO to 3  .
    • No: INSTALL a new liftgate release switch.
  3. CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR A SHORT TO GROUND
    1. Ignition OFF.
    2. Disconnect BCM C2280C.
    3. Measure:
      Liftgate Release Switch Ground
      G08040538
      G08040537
      C4216 Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 CPL45 (BN)
      G08040539
      		 - Ground

    Is the resistance greater than 10, 000 ohms? 

    • Yes: GO to  14.
    • No: REPAIR the circuit.
  4. CHECK THE EXTERIOR LIFTGATE RELEASE SWITCH
    1. Unlock the doors with the door lock control switch.
    2. Disconnect: Liftgate Release Switch.
    3. Connect a fused jumper wire:
      Liftgate Release Switch Liftgate Release Switch
      G08040540
      G08040541
      C4216 C4216
      Pin Circuit Measurement / Action Pin Circuit
      2 CPL45 (BN)
      G08040542
      		 1 GD349 (BK/GY)

    Does the liftgate release? 

    • Yes: INSTALL a new liftgate release switch.
    • No: LEAVE the jumper wire connected. GO to 5  .
  5. CHECK FOR BCM DTCs  FROM THE SELF-TEST
    1. Using a scan tool, clear the BCM DTCs  .
    2. Using a scan tool, perform the BCM self-test with the jumper wire still connected.

    Is DTC B12E8:11 retrieved? 

    • Yes: REMOVE the jumper wire. GO to  8.
    • No: REMOVE the jumper wire. GO to 6  .
  6. CHECK THE LIFTGATE RELEASE SWITCH GROUND CIRCUIT FOR AN OPEN
    1. Using a scan tool, clear the BCM DTCs  .
    2. Connect a fused jumper wire:
      Liftgate Release Switch Ground
      G08040543
      G08040544
      C4216 Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 CPL45 (BN)
      G08040545
      		 - Ground
    3. Using a scan tool, perform the BCM self-test.

    Is DTC B12E8:11 retrieved? 

    • Yes: REPAIR the liftgate release switch ground circuit.
    • No: GO to 7  .
  7. CHECK THE LIFTGATE RELEASE SWITCH INPUT CIRCUIT FOR AN OPEN
    1. Ignition OFF.
    2. Disconnect BCM C2280C.
    3. Measure:
      Liftgate Release Switch BCM
      G08040546
      G08040547
      C4216 C2280C
      Pin Circuit Measurement / Action Pin Circuit
      2 CPL45 (BN)
      G08040548
      		 23 CPL45 (BN)

    Is the resistance less than 3 ohms? 

    • Yes: GO to  14.
    • No: REPAIR the circuit.
  8. CHECK FOR VOLTAGE TO THE LIFTGATE LATCH OR LTM
    1. Ignition OFF.
    2. Disconnect: Liftgate Latch (manual liftgate).
    3. Disconnect: LTM C4174B (power liftgate).
    4. Ignition ON.
    5. For manual liftgate, measure:
      Liftgate Latch Ground
      G08040550
      G08040549
      C457 Ground
      Pin Circuit Measurement / Action Pin Circuit
      1 CPL84 (GN/BN)
      G08040551
      		 - Ground
    6. For power liftgate, measure:
      LTM Ground
      G08040552
      G08040553
      C4174B Ground
      Pin Circuit Measurement / Action Pin Circuit
      25 CPL84 (GN/BN)
      G08040554
      		 - Ground

    Is any voltage present? 

    • Yes: GO to 9  .
    • No: GO to  10.
  9. CHECK FOR A SHORT TO VOLTAGE
    1. Ignition OFF.
    2. Disconnect BCM C2280D.
    3. Ignition ON.
    4. Measure:
      BCM Ground
      G08040555
      G08040556
      C2280D Ground
      Pin Circuit Measurement / Action Pin Circuit
      29 CPL84 (GN/BN)
      G08040557
      		 - Ground

    Is any voltage present? 

    • Yes: REPAIR the circuit for a short to voltage.
    • No: GO to  14.
  10. CHECK FOR BCM OUTPUT
    NOTE: The BCM only supplies voltage for the liftgate latch release momentarily. It is important to monitor the test light while activating the liftgate release switch.
    1. Ignition OFF.
    2. Connect: Liftgate Release Switch.
    3. Unlock the doors with the door lock control switch.
    4. For manual liftgate, press the liftgate release switch while monitoring the test light.
      Liftgate Latch Ground
      G08040558
      G08040559
      C457 Ground
      Pin Circuit Measurement / Action Pin Circuit
      1 CPL84 (GN/BN) Test Light - Ground
    5. For power liftgate, press the liftgate release switch while monitoring the test light.
      LTM Ground
      G08040560
      G08040561
      C4174B Ground
      Pin Circuit Measurement / Action Pin Circuit
      25 CPL84 (GN/BN) Test Light - Ground

    Does the test light momentarily illuminate? 

    • Yes: For a manual liftgate, GO to  12.

      For a power liftgate, GO to  13.

    • No: VERIFY the BCM fuse 25 (15A) is OK. If OK, GO to  11.
  11. CHECK THE LIFTGATE RELEASE OUTPUT CIRCUIT FOR AN OPEN
    1. Disconnect: BCM C2280D.
    2. For manual liftgate, measure:
      Liftgate Latch BCM
      G08040562
      G08040563
      C457 C2280D
      Pin Circuit Measurement / Action Pin Circuit
      1 CPL84 (GN/BN)
      G08040564
      		 29 CPL84 (GN/BN)
    3. For power liftgate, measure:
      LTM BCM
      G08040565
      G08040566
      C4174B C2280D
      Pin Circuit Measurement / Action Pin Circuit
      25 CPL84 (GN/BN)
      G08040567
      		 29 CPL84 (GN/BN)

    Is the resistance less than 3 ohms? 

    • Yes: GO to  14.
    • No: REPAIR the circuit.
  12. CHECK THE LIFTGATE LATCH GROUND CIRCUIT FOR AN OPEN
    1. Measure:
      Liftgate Latch Ground
      G08040568
      G08040569
      C457 Ground
      Pin Circuit Measurement / Action Pin Circuit
      2 GD349 (BK/GY)
      G08040570
      		 - Ground

    Is the resistance less than 3 ohms? 

    • Yes: INSTALL a new liftgate latch. REFER to LIFTGATE LATCH .
    • No: REPAIR the circuit.
  13. CHECK FOR CORRECT LTM OPERATION
    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 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? 

    • 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) .
    • 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.
  14. CHECK FOR CORRECT BCM OPERATION
    1. Ignition OFF.
    2. Disconnect and inspect all BCM 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 BCM 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? 

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