Diagnostic Routine B
Diagnostic Routine B
Diagnostic Overview
A Single or More Than One Door Lock Is Inoperative
Refer to Wiring Diagram Set 117 for schematic and connector information Electrical Diagrams.
Normal Operations and Fault Conditions
The RFA (Remote Function Actuator) module supplies voltage and ground to all of the door lock actuators by controlling the lock all and unlock all relays. The non-serviceable lock relays inside the RFA (Remote Function Actuator) module receive voltage from the BCM (Body Control Module). The lock relays receive ground through a dedicated ground circuit to the RFA (Remote Function Actuator) module. Upon a lock request, the RFA (Remote Function Actuator) module supplies voltage on the all door lock circuit and ground on the driver and passenger door unlock circuits. Upon an unlock request, the voltage and ground are reversed on the previously listed circuits. When the door lock and unlock relays are not energized, they are connected to ground.
The RFA (Remote Function Actuator) module receives inputs from the keyless entry keypad, and the IA (Intelligent Access) key data from the TPM (Tire Pressure Monitor) module. The BCM (Body Control Module) receives input from the door lock control switches and both modules share the information obtained from the inputs over the MS-CAN (Medium Speed Controller Area Network).
Visual Inspection and Diagnostic Pre-checks
- Binding lock rod
Special Tool(s)
Pinpoint Test
1. CHECK THE DOOR LATCH FOR BINDING
1. Lock and unlock the inoperative door lock using the door lock rod.
Does the door lock and unlock?
2. CHECK THE LOCK ROD FOR BINDING
1. Operate the door lock rod manually while observing the door lock rod for any binding or if the rod is bent.
Is the door lock rod bent or binding?
3. CHECK THE ALL LOCK OUTPUT CIRCUIT FOR VOLTAGE
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test lamp recommended in the Special Tools table at the beginning 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.
1. Ignition OFF.
2. Disconnect: Inoperative Door Lock Actuator.
3. NOTE: The RFA (Remote Function Actuator) module only supplies voltage to the actuator momentarily. It is important to monitor the test light while pressing LOCK on a door lock control switch.
While pressing the door lock control switch in the LOCK position, monitor:
Does the test light momentarily illuminate?
4. CHECK THE UNLOCK OUTPUT CIRCUIT FOR VOLTAGE
NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test lamp recommended in the Special Tools table at the beginning 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.
1. NOTE: The RFA (Remote Function Actuator) module only supplies voltage to the actuator momentarily. It is important to monitor the test light while pressing UNLOCK on a door lock control switch.
While pressing the door lock control switch in the UNLOCK position, monitor:
Does the test light momentarily illuminate?
5. CHECK THE UNLOCK OUTPUT CIRCUIT FOR AN OPEN
1. Disconnect: RFA (Remote Function Actuator) Module C2153D.
2. Measure:
Is the resistance less than 3 ohms?
6. CHECK FOR CORRECT RFA (Remote Function Actuator) MODULE OPERATION
1. Ignition OFF.
2. Disconnect and inspect all RFA (Remote Function Actuator) module 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 the RFA (Remote Function Actuator) module 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?
