Pinpoint Tests AF: The Message Center Is Not Operating Correctly
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test AF: The Message Center Is Not Operating Correctly
Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number
Normal Operation
The message center uses the Instrument Panel Cluster (IPC) RUN/START voltage and the IPC ground. The message center functionality is controlled through the message center switch and is hardwired to the IPC through a signal and return circuit.
There are 3 message center switch buttons with each button operating a switch that uses different resistance values. The IPC sends out a reference voltage to the message center switch and monitors the voltage drop when a message center switch button is pressed. The voltage drop varies depending upon the resistance of each button, providing a specific indication to the IPC which switch is pressed.
- DTC B1A82:09 (External Trip Switch: Component Failure) - a continuous DTC that sets in the IPC if the IPC detects the switch has failed.
- DTC B1A82:11 (External Trip Switch: Circuit Short to Ground) - a continuous DTC that sets in the IPC if the IPC detects a short to ground.
- DTC B1A82:13 (External Trip Switch: Circuit Open) - a continuous DTC that sets in the IPC if the IPC detects an open.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Message center switch
- IPC
PINPOINT TEST AF: THE MESSAGE CENTER IS NOT OPERATING CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
-------------------------------------------------
AF1 RETRIEVE THE RECORDED DTCs FROM THE IPC SELF-TEST
- Check for recorded DTCs from the IPC self-test.
- Are any DTCs recorded?
Yes
For DTC B1A82:09, CLEAR the DTCs. REPEAT the self-test. If DTC B1A82:09 returns, INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement.
For DTC B1A82:11 or DTC B1A82:13, GO to AF5.
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to AF2.
-------------------------------------------------
AF2 CARRY OUT THE MESSAGE CENTER SWITCH OPERATION
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IPC DataLogger.
- Select the IPC message center switch PID (SWITCH_MODE).
- Monitor the PID display while pressing the message center switch buttons (INFO, SETUP and RESET).
- Does PID display A when the INFO button is pressed, B when the SETUP button is pressed and C when the RESET button is pressed?
Yes
GO to AF3.
No
If an individual message center button in inoperative, INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement. TEST the system for normal operation.
If all message center buttons are inoperative, GO to AF4.
-------------------------------------------------
AF3 CARRY OUT THE IPC DEALER TEST MODE
- NOTE: The all segments display is the second button press after entering the dealer test mode immediately following the gauge test.
- Enter the IPC dealer test mode. Scroll through the displays until the message center displays all the segments.
- Does the message center display illuminate all the segments?
Yes
The message center is operating correctly at this time.
If an individual message in not operating correctly, GO to Symptom Chart - Information And Message Center. Symptom Chart - Information and Message Center
No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
-------------------------------------------------
AF4 CHECK FOR VOLTAGE FROM THE IPC
- Connect: IPC C220.
- Disconnect: Message Center Switch C253.
- Ignition ON.
- Measure the voltage between the message center switch C253-5, circuit CMC29 (GN/VT), harness side and the message center switch C253-4, circuit RMC27 (WH/BN), harness side.
- Is the voltage approximately 5 volts or greater?
Yes
INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement. TEST the system for normal operation.
No
GO to AF8.
-------------------------------------------------
AF5 CHECK THE MESSAGE CENTER SIGNAL AND RETURN CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: IPC C220.
- Ignition ON.
- Measure the voltage between the IPC C220-16, circuit CMC29 (GN/VT), harness side and ground; and between the IPC C220-3, circuit RMC27 (WH/BN), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
No
GO to AF6.
-------------------------------------------------
AF6 CHECK THE MESSAGE CENTER SIGNAL CIRCUIT FOR AN OPEN AND SHORT TO GROUND
- Ignition OFF.
- Disconnect: Message Center Switch C253.
- Measure the resistance between the IPC C220-16, circuit CMC29 (GN/VT), harness side and the message center switch
C253-5, circuit CMC29 (GN/VT), harness side; and between the IPC C220-16, circuit CMC29 (GN/VT), harness side and ground.
- Is the resistance less than 5 ohms between the IPC, and the message center switch, and greater than 10,000 ohms between the IPC and ground?
Yes
GO to AF7.
No
REPAIR circuit CMC29 (GN/VT). CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
AF7 CHECK THE MESSAGE CENTER RETURN CIRCUIT FOR AN OPEN
- Measure the resistance between the IPC C220-3, circuit RMC27 (WH/BN), harness side and the message center switch C253-4, circuit RMC27 (WH/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement.
No
REPAIR circuit RMC27 (WH/BN) for an open. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
AF8 CHECK FOR CORRECT IPC OPERATION
- Disconnect the IPC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?
Yes
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Instrument Panel Cluster (IPC). TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
-------------------------------------------------