Diagnostic Routine C

Diagnostic Routine C

Diagnostic Overview

U201F:31

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 TPM (Tire Pressure Monitor) module. The TPM (Tire Pressure Monitor) module then communicates the command to the RFA (Remote Function Actuator) module and the RFA (Remote Function Actuator) module either switches the ignition to the requested mode or starts the engine.

The TPM (Tire Pressure Monitor) module receives voltage at all times and has a dedicated ground circuit. The TPM (Tire Pressure Monitor) module sends TPMS (Tire Pressure Monitoring System) information over the MS-CAN (Medium Speed Controller Area Network) to the BCM (Body Control Module). The TPM (Tire Pressure Monitor) 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 TPM (Tire Pressure Monitor) module, the vehicle experiences a no-start unless the IA (Intelligent Access) key is placed in the backup slot.

DTC Fault Trigger Conditions






Pinpoint Test

1. CHECK FOR COMMUNICATION WITH THE TPM (Tire Pressure Monitor) MODULE

1. Using a scan tool, perform network test.

Does the TPM (Tire Pressure Monitor) module pass the network test?








2. CHECK THE TPM (Tire Pressure Monitor) MODULE COMMUNICATION CIRCUIT FOR A SHORT TO VOLTAGE

NOTE: Place the IA (Intelligent Access) key in the backup slot for this pinpoint test.

1. Ignition OFF.

2. Disconnect: TPM (Tire Pressure Monitor) Module.

3. Disconnect: RFA (Remote Function Actuator) Module C2153E.

4. Ignition ON.

5. Measure:





Is any voltage present?








3. CHECK THE TPM (Tire Pressure Monitor) MODULE COMMUNICATION CIRCUIT FOR AN OPEN OR SHORT TO GROUND

1. Ignition OFF.

2. Measure:





3. Measure:





Is the resistance less than 3 ohms between the TPM (Tire Pressure Monitor) module and the RFA (Remote Function Actuator) module; and greater than 10,000 ohms between the TPM (Tire Pressure Monitor) module and ground?








4. CHECK FOR CORRECT RFA (Remote Function Actuator) MODULE OPERATION

1. Disconnect and inspect all the RFA (Remote Function Actuator) module connectors.

2. Repair:

- corrosion (replace connector or terminals - clean module pins)
- damaged or bent pins - replace terminals/pins
- pushed-out pins - replace pins as necessary

3. Connect all the RFA (Remote Function Actuator) module connectors. Make sure they seat and latch correctly.

4. Operate the system and verify the concern is still present.

Is the concern still present?