Diagnostic Routine G
Diagnostic Routine G
Diagnostic Overview
U201F:00, U201F:13 or U201F:87
Refer to Wiring Diagram Set 112 for schematic and connector information Electrical Diagrams.
Normal Operations and Fault Conditions
When the IA (Intelligent Access) key is activated by one of the low frequency passive start antennas, the transmitter in the IA (Intelligent Access) key sends a radio signal to the RFR (Remote Functions Receiver) module. The RFR (Remote Functions Receiver) module then communicates the command to the RFA (Remote Function Actuator) module.
The RFR (Remote Functions Receiver) module receives voltage at all times and has a dedicated ground circuit. The RFR (Remote Functions Receiver) module sends all RKE (Remote Keyless Entry) and IA (Intelligent Access) key information and requests to the RFA (Remote Function Actuator) module through a dedicated single circuit network.
In the event of a failure with the RFR (Remote Functions Receiver) module, the vehicle experiences a no-start unless the IA (Intelligent Access) key is placed in the backup slot.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- BCM (Body Control Module) fuse 81 (5A)
Pinpoint Test
1. CHECK FOR VOLTAGE TO THE RFR (Remote Functions Receiver) MODULE
1. Ignition OFF.
2. Disconnect: RFR (Remote Functions Receiver) Module.
3. Measure:
Is the voltage greater than 11 volts?
2. CHECK THE RFR (Remote Functions Receiver) MODULE VOLTAGE SUPPLY CIRCUIT
1. Measure:
Is the voltage greater than 11 volts?
3. CHECK THE RFR (Remote Functions Receiver) MODULE COMMUNICATION CIRCUIT FOR A SHORT TO VOLTAGE
1. Disconnect: RFA (Remote Function Actuator) Module C4392D.
2. Disconnect: Ignition relay.
3. Connect:
4. Measure:
Is any voltage present?
4. ISOLATE THE SHORT TO VOLTAGE
1. Disconnect: BCM (Body Control Module) C2280B.
2. Measure:
Is any voltage present?
5. ISOLATE THE BCM (Body Control Module) FOR THE SHORT TO VOLTAGE
1. Disconnect: BCM (Body Control Module) C2280H.
2. Measure:
Is any voltage present?
6. CHECK THE RFR (Remote Functions Receiver) MODULE COMMUNICATION CIRCUIT FOR A SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
7. ISOLATE THE SHORT TO GROUND
1. Disconnect: BCM (Body Control Module) C2280B.
2. Measure:
Is the resistance greater than 10,000 ohms?
8. ISOLATE THE BCM (Body Control Module) FOR THE SHORT TO GROUND
1. Disconnect: BCM (Body Control Module) C2280H.
2. Measure:
Is the resistance greater than 10,000 ohms?
9. CHECK THE RFR (Remote Functions Receiver) MODULE COMMUNICATION CIRCUIT FOR AN OPEN
1. Measure:
Is the resistance less than 3 ohms?
10. ISOLATE THE OPEN CIRCUIT
1. Disconnect: BCM (Body Control Module) C2280H.
2. Measure:
Is the resistance less than 3 ohms?
11. ISOLATE THE OPEN CIRCUIT
1. Disconnect: BCM (Body Control Module) C2280B.
2. Measure:
Is the resistance less than 3 ohms?
12. CHECK FOR CORRECT BCM (Body Control Module) OPERATION
1. Ignition OFF.
2. Disconnect and inspect all BCM (Body Control Module) connectors.
3. Repair:
- corrosion, (install new connectors or terminals, clean module pins)
- damaged or bent pins, install new terminals pins
- pushed-out pins, install new pins as necessary
4. Reconnect all the BCM (Body Control Module) connectors and make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
13. 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 connectors or terminals- clean module pins)
- damaged or bent pins- install new terminals pins
- pushed-out pins- install new pins as necessary
4. Reconnect all the RFA (Remote Function Actuator) module connectors and make sure they seat and latch correctly.
5. Operate the system and determine if the concern is still present.
Is the concern still present?
