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Home >> Ford >> 2010 >> Mustang V6-4.0L >> Repair and Diagnosis >> Instrument Panel, Gauges and Warning Indicators >> Testing and Inspection >> Pinpoint Tests >> Instrumentation, Message Center and Warning Chimes >> Pinpoint Tests AJ: The Message Center Is Not Operating Correctly

Pinpoint Tests AJ: The Message Center Is Not Operating Correctly




Instrumentation, Message Center and Warning Chimes

Pinpoint Tests


Pinpoint Test AJ: 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 shares the Instrument Panel Cluster (IPC) RUN/START voltage, keep alive memory voltage and the IPC logic ground to operate. The message center functionality is controlled through the message center switch and is hardwired to the IPC through separate signal and return circuits.

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 will vary depending upon the resistance of each button, providing a specific indication to the IPC which switch is pressed.

- 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 on the message center signal circuit.
- DTC B1A82:13 (External Trip Switch: Circuit Open) - a continuous DTC that sets in the IPC if the IPC detects an open on the message center signal circuit.
- DTC B1A82:23 (External Trip Switch: Signal Stuck Low) - a continuous DTC that sets in the IPC if the IPC senses any message center button as pressed for greater then 120 seconds.

If any one of the message center switch buttons is stuck the fault recognized by the vehicle occupants will be the following:

- RESET button stuck: Upon each transition from Off/ACC to RUN/START, the message center will display ENGINEERING TEST MODE for 3 seconds.
- INFO button stuck: The message center display will continuously scroll through the INFO menu.
- SETUP button stuck: The message center display will continuously scroll through the SETUP menu.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Message center switch
- IPC



PINPOINT TEST AJ: 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.

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AJ1 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 B1A82:23, INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement. TEST the system for normal operation.

For DTC B1A82:11 or DTC B1A82:13 GO to AJ5.

For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes

No
GO to AJ2.

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AJ2 CHECK THE IPC ODOMETER DISPLAY


- Ignition ON.
- Observe the odometer display in the message center.
- Is the odometer displayed?

Yes
GO to AJ3.

No
If the display is blank, PRESS the INFO button to see if the message center was previously set to the blank display.

If the display remains blank, INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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AJ3 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 illuminate all the segments?

Yes
GO to AJ4.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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AJ4 CHECK FOR VOLTAGE FROM THE IPC


- Ignition OFF.
- 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?

Yes
INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement. TEST the system for normal operation.

No
GO to AJ10.

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AJ5 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 C220-6, circuit CMC29 (GN/VT), harness side and ground; and between the IPC C220-4, 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 AJ6.

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AJ6 CHECK FOR A SHORT TOGETHER ON THE IPC SIGNAL AND RETURN CIRCUITS


- Ignition OFF.
- Measure the resistance between the IPC C220-6, circuit CMC29 (GN/VT), harness side; and between the IPC C220-4, circuit RMC27 (WH/BN), harness side.




- Is the resistance greater than 10,000 ohms?

Yes
GO to AJ7.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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AJ7 CHECK THE MESSAGE CENTER SIGNAL CIRCUIT FOR AN OPEN


- Disconnect: Message Center Switch C253.
- Measure the resistance between the IPC C220-6, circuit CMC29 (GN/VT), harness side and the message center switch C253-5, circuit CMC29 (GN/VT), harness side.




- Is the resistances less than 5 ohms?

Yes
GO to AJ8.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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AJ8 CHECK THE MESSAGE CENTER RETURN CIRCUIT FOR AN OPEN


- Measure the resistance between the IPC C220-4, 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
GO to AJ9.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

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AJ9 CHECK FOR THE MESSAGE CENTER SWITCH OPERATION


- Ignition OFF.
- Disconnect: IPC C253.
- Connect: Message Center Switch C220.
- Measure the resistance 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 while pressing the message center buttons according to the following table.









- Is the resistance within the specifications for all positions?

Yes
GO to AJ6.

No
INSTALL a new IPC. REFER to Instrument Panel Cluster (IPC) Service and Repair. TEST the system for normal operation.

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AJ10 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 verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement. CLEAR the DTCs. REPEAT the self-test.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

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