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Home >> Cadillac >> 2012 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1780 (Power Door Lock System And Release Systems) >> Diagnostic Information and Procedures >> Liftgate/Liftgate Window Ajar Indicator Malfunction (Manual Liftgate) >> Circuit/System Testing
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Circuit/System Testing

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Ajar Indicator Inoperative With Liftgate

  1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
  2. Test for less than 1 Ω between the ground circuit terminal 5 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a 3A fused jumper wire between the signal circuit terminal 6 and ground. Verify the scan tool Rear Closure Ajar Sw. parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance.
  4. If all circuits test normal, test or replace the liftgate latch assembly.

Ajar Indicator Inoperative With Liftglass

  1. Ignition OFF, disconnect the harness connector at the liftglass window latch assembly.
  2. Test for less than 1 Ω between the ground circuit terminal 3 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Rear Closure Ajar Sw. parameter is Active.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance.
  4. If all circuits test normal, test or replace the liftgate latch assembly.

Ajar Indicator Always ON

  1. Ignition OFF, disconnect the harness connector at the liftgate latch assembly.
  2. Disconnect the harness connector at the liftgate window latch assembly.
  3. Disconnect the harness connector at the rear window wiper motor.
  4. Ignition ON, verify the scan tool Rear Closure Ajar Sw. parameter is Inactive.
    • If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuits test normal, replace the BCM.
    • Signal circuit terminal 4 - liftgate window latch assembly
    • Signal circuit terminal 6 - liftgate latch assembly
    • Signal circuit terminal C - rear window wiper motor
  5. Ignition OFF, connect the harness connector at the liftglass window latch assembly.
  6. Ignition ON, observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the liftglass. The parameter should change from Inactive to Active
    • If the value does not change, test or replace the liftglass window latch assembly.
  7. Ignition OFF, connect the harness connector at the liftgate latch assembly.
  8. Ignition ON, observe the scan tool Rear Closure Ajar Sw. parameter while opening and closing the liftgate. The parameter should change from Inactive to Active
    • If the value does not change, test or replace the liftgate latch assembly.
  9. If all circuits test normal, replace the rear window wiper motor.
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