Door Ajar Indicator Malfunction
Door Ajar Indicator Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category
Diagnostic Fault Information
Circuit/System Description
The driver window motor provides a 12 V signal to the driver door ajar switch signal circuit. The body control module (BCM) provides a 12 V signal to each of the passenger, rear door ajar switch signal circuits and the trunk/liftgate ajar signal circuit. The door ajar switches are integral to each door latch assembly and the trunk/liftgate ajar switch is integral to the liftgate latch and the rear compartment lid latch. When a door, trunk or liftgate is opened, the normally open ajar switch closes. With the ajar switch closed, ground is provided to the ajar switch signal circuit. The driver window motor and/or BCM the voltage drop and sends a serial data message to the instrument panel to display the door ajar indicator.
Reference Information
Schematic Reference
Door Lock/Indicator Schematics Door Lock/Indicator Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
Description and Operation
Door Ajar Indicator Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, observe the scan tool Driver Door Ajar Switch parameter while opening and closing the driver door. The parameter should change between Active and Inactive.
• If the value does not change, refer to Driver Door Ajar Switch Malfunction.
2. Observe the scan tool Passenger Door Ajar Switch parameter while opening and closing the front passenger door. The parameter should change between Active and Inactive.
• If the value does not change, refer to Passenger Door Ajar Switch Malfunction.
3. Observe the scan tool Left Rear Door Ajar Switch and Right Rear Door Ajar Switch parameters while opening and closing the left and right rear doors. The value should change between Inactive and Active.
• If a value does not change, refer to Rear Door Ajar Switch Malfunction.
4. Observe the scan tool Rear Closure Ajar Switch parameter while opening and closing the trunk or liftgate. The parameter should change between Inactive and Active.
• If a value does not change, refer to Trunk/Liftgate Ajar Switch Malfunction.
Circuit/System Testing
Driver Door Ajar Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the A23D door latch assembly - driver or the B28D door ajar switch-driver.
2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:
* A23D door latch assembly-driver - ground circuit terminal 8
* B28D door ajar switch-driver - ground circuit terminal 2
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Driver Door Ajar Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the M74D window motor - driver (AXG) or the K9 body control module (A55).
* A23D door latch assembly-driver - signal circuit terminal 6
* B28D door ajar switch-driver - signal circuit terminal 1
4. Install a 3 A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Driver Door Ajar Switch parameter is Active.
* A23D door latch assembly-driver - signal circuit terminal 6
* B28D door ajar switch-driver - signal circuit terminal 1
• 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 M74D window motor - driver (AXG) or the K9 body control module (A55).
5. If all circuits test normal, test or replace the A23D door latch assembly - driver or the B28D door ajar switch-driver.
Passenger Door Ajar Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the A23P door latch assembly - passenger or the B28P door ajar switch-passenger.
2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:
* A23P door latch assembly-passenger - ground circuit terminal 3
* B28P door ajar switch-passenger - ground circuit terminal 2
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the scan tool Passenger Door Ajar Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K9 body control module.
4. Install a 3 A fused jumper wire between the signal circuit terminal 1 and ground. Verify the scan tool Passenger Door Ajar Switch parameter is Active.
• 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 K9 body control module.
5. If all circuits test normal, test or replace the A23P door latch assembly - passenger or the B28P door ajar switch-passenger.
Rear Door Ajar Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate rear A23 door latch assembly or the B28 door ajar switch.
2. Test for less than 10 ohms between the ground circuit terminal listed below and ground:
* A23LR door latch assembly-left rear - ground circuit terminal 8
* B28LR door ajar switch-left rear - ground circuit terminal 2
* A23RR door latch assembly-right rear - ground circuit terminal 3
* B28RR door ajar switch-right rear - ground circuit terminal 2
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify the appropriate scan tool Rear Door Ajar Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the K9 body control module.
* A23LR door latch assembly-left rear - signal circuit terminal 6
* B28LR door ajar switch-left rear - signal circuit terminal 1
* A23RR door latch assembly-right rear - signal circuit terminal 1
* B28RR door ajar switch-right rear - signal circuit terminal 1
4. Install a 3 A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Rear Door Ajar Switch parameter is Active.
* A23LR door latch assembly-left rear - signal circuit terminal 6
* B28LR door ajar switch-left rear - signal circuit terminal 1
* A23RR door latch assembly-right rear - signal circuit terminal 1
* B28RR door ajar switch-right rear - signal circuit terminal 1
• If not the specified value, test the signal circuit terminal for an a short to voltage or an open/high resistance. If the circuit tests normal, replace the K9 body control module.
5. If all circuits tests normal, test or replace the rear A23 door latch or the B28 door ajar switch.
Trunk/Liftgate Ajar Switch Malfunction
1. Ignition OFF, disconnect the harness connector at the appropriate M30 liftgate latch or M40 rear compartment lid latch.
2. Ignition ON, verify the scan tool Rear Closure Ajar Switch parameter is Inactive.
• If not the specified value, test the signal circuit terminal listed below for a short to ground. If the circuit tests normal, replace the K9 body control module.
* M30♦liftgate latch - signal circuit terminal♦2
* M40♦rear compartment lid latch - signal circuit terminal♦4
3. Install a 3 A fused jumper wire between the signal circuit terminal listed below and ground. Verify the scan tool Rear Closure Ajar Switch parameter is Active.
• 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 K9 body control module.
4. If all circuits test normal, test or replace the M30 liftgate latch or M40 rear compartment lid latch.
Component Testing
Door Ajar Switch
1. Ignition OFF, disconnect the harness connector at the appropriate A23 door latch or the B28 door ajar switch.
2. With the switch in the open position, test for infinite resistance between the signal and the ground terminals listed below:
* A23D Driver door latch - signal terminal 6 and ground terminal 8
* B28D Driver door ajar switch - signal terminal 1 and ground terminal 8
* A23LR Left rear door latch - signal terminal 6 and ground terminal 8
* B28LR Left rear door ajar switch - signal terminal 1 and ground terminal 2
* A23RR Right rear door latch - signal terminal 1 and ground terminal 3
* B28RR Right rear door ajar - signal terminal 1 and ground terminal 2
* A23P Passenger door latch - signal terminal 1 and ground terminal 3
* B28P Passenger door ajar - signal terminal 1 and ground terminal 2
• If not the specified value, replace the A23 door latch or the B28 door ajar switch.
3. With the switch in the closed position, test for less than 5 ohms between the signal and the ground terminals listed below:
* A23D Driver door latch - signal terminal 6 and ground terminal 8
* B28D Driver door ajar switch - signal terminal 1 and ground terminal 8
* A23LR Left rear door latch - signal terminal 6 and ground terminal 8
* B28LR Left rear door ajar switch - signal terminal 1 and ground terminal 2
* A23RR Right rear door latch - signal terminal 1 and ground terminal 3
* B28RR Right rear door ajar - signal terminal 1 and ground terminal 2
* A23P Passenger door latch - signal terminal 1 and ground terminal 3
* B28P Passenger door ajar - signal terminal 1 and ground terminal 2
• If greater than the specified range, replace the A23 door latch or the B28 door ajar switch.
Trunk/Liftgate Ajar Switch
1. Ignition OFF, disconnect the harness connector at the appropriate M30 liftgate latch or M40 rear compartment lid latch.
2. With the switch in the open position, test for infinite resistance between the signal and the ground terminals listed below:
* M30 liftgate latch - signal terminal 4 and ground terminal 2
* M40 rear compartment lid latch - signal terminal 2 and ground terminal 1
• If not the specified value, replace the M30 liftgate latch or M40 rear compartment lid latch.
3. With the switch in the closed position, test for less than 5 ohms between the signal and the ground terminals listed below:
* M30 liftgate latch - signal terminal 4 and ground terminal 2
* M40 rear compartment lid latch - signal terminal 2 and ground terminal 1
• If greater than the specified range, replace the M30 liftgate latch or M40 rear compartment lid latch.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Front Side Door Latch Replacement Service and Repair
* Rear Side Door Latch Replacement Service and Repair
* Front Side Door Window Regulator Motor Replacement Service and Repair
* Rear Compartment Lid Latch Replacement Rear Compartment Lid Latch Replacement
* Liftgate Latch Replacement Liftgate Latch Replacement
* Control Module References Control Module References for BCM replacement, programming and setup