Pinpoint Tests AN: The Message Center Is Not Operating Correctly
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test AN: 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 functionality is controlled through the message center switch, which is hardwired to the Instrument Cluster (IC) through input and return circuits. There are 3 message center switch buttons with each button operating a switch that uses different resistance values. The IC sends out a reference voltage to the message center switch on the input circuit 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 IC, which switch is pressed.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Message center switch
- IC
PINPOINT TEST AN: 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.
-------------------------------------------------
AN1 CHECK THE IC ODOMETER OPERATION
- Ignition ON.
- Observe the odometer display in the message center.
- Is the odometer displayed?
Yes
GO to AN2.
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, GO to AN9.
-------------------------------------------------
AN2 CHECK THE MESSAGE CENTER DISPLAY OPERATION USING THE SCAN TOOL
- Enter the following diagnostic mode on the scan tool: IC DataLogger .
- Select the IC display segment control (SEGMENTS) active command. Command the display segments on. Observe the message center display.
- Does the message center display illuminate all segments?
Yes
GO to AN3.
No
GO to AN9.
-------------------------------------------------
AN3 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST
- Retrieve the recorded IC DTCs from the self-test.
- Are any DTCs recorded?
Yes
For DTC B1205, GO to AN8.
For DTC B1206 or DTC B1208, GO to AN4.
For DTC B1209 (base cluster only), CHECK the IC lens for correct installation. If OK, GO to AN9.
For all other DTCs, REFER to DTC Charts. Instrumentation, Message Center and Warning Chimes
No
GO to AN8.
-------------------------------------------------
AN4 CHECK THE MESSAGE CENTER SWITCH SIGNAL AND RETURN CIRCUITS FOR A SHORT TO VOLTAGE
- Disconnect: IC C220 .
- Ignition ON.
- Measure the voltage between the ICC220-21, circuit CMC29 (GN/VT), harness side and ground; and between the ICC220-20, circuit RMC27 (WH/BN), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit in question for a short to voltage. CLEAR the DTCs. REPEAT the self-test.
No
GO to AN5.
-------------------------------------------------
AN5 CHECK THE MESSAGE CENTER SWITCH SIGNAL CIRCUIT FOR AN OPEN AND A SHORT TO GROUND
- Ignition OFF.
- Disconnect: Message Center Switch C265 .
- Measure the resistance between the IC C220-21, circuit CMC29 (GN/VT), harness side and the message center switch C265-3, circuit CMC29 (GN/VT), harness side; and between the IC C220-21, circuit CMC29 (GN/VT), harness side and ground.
- Is the resistance less than 5 ohms between the IC and the message center switch, and greater than 10,000 ohms between the IC and ground?
Yes
GO to AN6.
No
REPAIR circuit CMC29 (GN/VT) for an open or a short to ground. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
AN6 CHECK THE MESSAGE CENTER SWITCH RETURN CIRCUIT FOR AN OPEN
- Measure the resistance between the IC C220-20, circuit RMC27 (WH/BN), harness side and the message center switch C265-2, circuit RMC27 (WH/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to AN7.
No
REPAIR circuit RMC27 (WH/BN) for an open. CLEAR the DTCs. REPEAT the self-test.
-------------------------------------------------
AN7 CHECK FOR VOLTAGE FROM THE IC
- Connect: IC C220 .
- Ignition ON.
- Measure the voltage between the message center switch C265-3, circuit CMC29 (GN/VT), harness side and the message center switch C265-2, circuit RMC27 (WH/BN), harness side and ground.
- 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 AN9.
-------------------------------------------------
AN8 CHECK THE IC MESSAGE CENTER SWITCH PIDs USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger .
- Select the IC INFO switch, SETUP switch and RESET switch PIDs (INFOSW, SETUPSW, and RES_SW). Monitor the PIDs while pressing each message center switch button (INFO, SETUP and RESET).
- Do the PIDs agree with the switch position?
Yes
GO to AN9.
No
INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement. TEST the system for normal operation.
-------------------------------------------------
AN9 CHECK FOR CORRECT IC OPERATION
- Disconnect the IC) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC 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 IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). 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.
-------------------------------------------------