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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2008 🢒 STS 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Door Ajar Indicator Malfunction

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

Driver Door Ajar Switch Signal

1

1

1

--

Left Rear Door Ajar Switch Signal

1

1

1

--

Passenger Door Ajar Switch Signal

1

1

1

--

Right Rear Door Ajar Switch Signal

1

1

1

--

Driver Door Latch Ground

--

1

--

--

Passenger Door Latch Ground

--

1

--

--

Left Rear Door Latch Ground

--

1

--

--

Right Rear Door Latch Ground

--

1

--

--

1. Door Ajar Indicator Malfunction

Circuit/System Description

The individual door control modules each receive a discrete input from there respective door ajar switch signal circuits. The door ajar switches are integral to each door latch. When a door is opened, the normally open door ajar switch closes. With the door ajar switch closed, ground is provided to the door ajar switch signal circuit. The door control module interprets this and communicates a serial data message to the instrument panel cluster (IPC). When a door is open/ajar and the vehicle is in any gear other than PARK, the driver information center (DIC) will display DRIVER DOOR AJAR, PASSENGER DOOR AJAR, LEFT REAR DOOR AJAR or RIGHT REAR DOOR AJAR for the appropriate door that is opened. If the door is still ajar and the vehicle speed is greater than 5 km/h (3 mph) the door control module will send a serial data message to the IRC requesting a chime to sound.

Reference Information

Schematic Reference

Door Lock/Indicator Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

    •  Power Door Latch Description and Operation
    •  Power Door Locks Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Door Ajar Switch parameters while opening and closing each door. The parameter should change between Door Closed and Door Ajar.

⇒If the parameter does not change while opening and closing the driver door, refer to Driver Door Ajar Malfunction.
⇒If the parameter does not change while opening and closing the passenger door, refer to Passenger Door Ajar Malfunction.
⇒If the parameter does not change while opening and closing the left rear door, refer to Left Rear Door Ajar Malfunction.
⇒If the parameter does not change while opening and closing the right rear door, refer to Right Rear Door Ajar Malfunction.

Circuit/System Testing

Driver Door Ajar Malfunction

  1. Ignition OFF, disconnect the harness connector at the driver door latch.
  2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:
    3. • RHD ground circuit terminal 3
    • LHD ground circuit terminal 8
    ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Door Ajar Switch parameter is Door Closed.
    4. ⇒If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the DDM.
    • RHD signal circuit terminal 1
    • LHD signal circuit terminal 6
  4. Install a 3A fused jumper wire between the signal circuit terminal listed below and ground.
    5. • RHD signal circuit terminal 1
    • LHD signal circuit terminal 6
  5. Verify the scan tool Door Ajar Switch parameter is Door Ajar.
    6. ⇒If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the DDM.
  6. If all circuits tests normal, test or replace the driver door latch.

Passenger Door Ajar Malfunction

  1. Ignition OFF, disconnect the harness connector at the passenger door latch.
  2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:
    3. • RHD ground circuit terminal 3
    • LHD ground circuit terminal 8
    ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Door Ajar Switch parameter is Door Closed.
    4. ⇒If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the PDM.
    • RHD signal circuit terminal 1
    • LHD signal circuit terminal 6
  4. Install a 3A fused jumper wire between the signal circuit terminal listed below and ground.
    5. • RHD signal circuit terminal 1
    • LHD signal circuit terminal 6
  5. Verify the scan tool Door Ajar Switch parameter is Door Ajar.
    6. ⇒If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the PDM.
  6. If all circuits tests normal, test or replace the passenger door latch.

Left Rear Door Ajar Malfunction

  1. Ignition OFF, disconnect the harness connector at the left rear door latch.
  2. Test for less than 10 ohms between the ground circuit terminal 6 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Door Ajar Switch parameter is Door Closed.
    4. ⇒If not the specified value, test the signal circuit terminal 4 for a short to ground. If the circuit tests normal, replace the LRDM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 4 and ground. Verify the scan tool Door Ajar Switch parameter is Door Ajar.
    5. ⇒If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the LRDM.
  5. If all circuits tests normal, test or replace the left rear door latch.

Right Rear Door Ajar Malfunction

  1. Ignition OFF, disconnect the harness connector at the right rear door latch.
  2. Test for less than 10 ohms between the ground circuit terminal 3 and ground.
    3. ⇒If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Door Ajar Switch parameter is Door Closed.
    4. ⇒If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the RRDM.
  4. Install a 3A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool Door Ajar Switch parameter is Door Ajar.
    5. ⇒If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the RRDM.
  5. If all circuits tests normal, test or replace the right rear door latch.

Component Testing
  1. Ignition OFF, disconnect the harness connector at the appropriate door latch.
  2. Test for infinite resistance between the signal terminal and the ground terminal listed below with the door latch in the open position:
    3. • RHD driver door latch terminal 1 and 3
    • LHD driver door latch terminal 6 and 8
    • LHD passenger door latch terminal 1 and 3
    • RHD passenger door latch terminal 6 and 8
    • LR door latch terminal 4 and 6
    • RR door latch terminal 1 and 3
    ⇒If not the specified value, replace the door latch.
  3. Test for less than 2 ohms between the signal terminal and the ground terminal listed below with the door latch in the closed position;
    4. • RHD driver door latch terminal 1 and 3
    • LHD driver door latch terminal 6 and 8
    • LHD passenger door latch terminal 1 and 3
    • RHD passenger door latch terminal 6 and 8
    • LR door latch terminal 4 and 6
    • RR door latch terminal 1 and 3
    ⇒If greater than the specified range, replace the door latch.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Rear Door Lock Replacement
    •  Front Side Door Lock Replacement
    •  Control Module References for DDM, IPC, PDM, LRDM, or RRDM replacement, setup and programming