Diagnostic Routine C

Diagnostic Routine C

Diagnostic Overview

B10D9:87

Refer to Wiring Diagram Set 112 for schematic and connector information Electrical Diagrams.

Normal Operations and Fault Conditions

The BCM (Body Control Module) supplies voltage to the PATS (Passive Anti-Theft System) transceiver. When the ignition is turned to the RUN or START position, the BCM (Body Control Module) initiates the key interrogation sequence. The BCM (Body Control Module) starts the interrogation sequence by generating a signal and sending that signal to the transceiver on the transmit (TX) circuit. When the transceiver receives the signal from the BCM (Body Control Module), it reads the PATS (Passive Anti-Theft System) key and generates a challenge response to the BCM (Body Control Module) signal. The transceiver sends the challenge response back to the BCM (Body Control Module) on the receive (RX) circuit.

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- BCM (Body Control Module) fuse 18 (10A).

Pinpoint Test

1. RETRIEVE THE BCM (Body Control Module) DTCs (Diagnostic Trouble Codes) FROM THE SELF-TEST

1. Using a scan tool, perform the BCM (Body Control Module) self-test.

Is DTC (Diagnostic Trouble Code) C113A:11 or C113A:15 recorded?








2. CHECK FOR VOLTAGE TO THE PATS (Passive Anti-Theft System) TRANSCEIVER

1. Disconnect: PATS (Passive Anti-Theft System) Transceiver.

2. Ignition ON.

3. Measure:





Is the voltage greater than 11 volts?








3. CHECK THE PATS (Passive Anti-Theft System) TRANSCEIVER VOLTAGE SUPPLY CIRCUIT

1. Measure:





Is the voltage greater than 11 volts?








4. CHECK THE PATS (Passive Anti-Theft System) TRANSCEIVER CIRCUITS FOR A SHORT TO VOLTAGE

1. Ignition OFF.

2. Disconnect: BCM (Body Control Module) C2280B.

3. Ignition ON.

4. Measure:





Is any voltage present?








5. CHECK THE PATS (Passive Anti-Theft System) TRANSCEIVER CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Measure:





Are the resistances greater than 10,000 ohms?








6. CHECK THE PATS (Passive Anti-Theft System) TRANSCEIVER CIRCUITS FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?








7. 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 connector 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. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?