Pinpoint Tests AH: The Message Center Switch Does Not Operate Correctly
Instrumentation, Message Center and Warning Chimes
Pinpoint Tests
Pinpoint Test AH: The Message Center Switch Does Not Operate Correctly
Refer to Wiring Diagram Set 60, Instrument Cluster for schematic and connector information. Diagrams By Number
Normal Operation
The message center switch assembly uses circuits 1410 (TN/OG) and 1411 (GY/OG) to communicate the requested switch function to the message center.
- DTC B1205 (EIC Switch-1 Assembly Circuit Failure) - an on-demand DTC that sets if the Instrument Cluster (IC) detects any of the message center buttons pressed during the self-test.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Message center switch
- IC
PINPOINT TEST AH: THE MESSAGE CENTER SWITCH DOES NOT OPERATE 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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AH1 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND IC SELF-TESTS
- Check the recorded IC DTCs from the continuous and on-demand self-tests.
- Is DTC B1205 recorded?
Yes
INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement. TEST the system for normal operation.
No
GO to AH2.
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AH2 CHECK THE IC PID FOR THE MESSAGE CENTER SWITCH USING THE SCAN TOOL
- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC message center INFO switch (INFOSW), SETUP switch (SETUPSW) and RESET switch (RES_SW) PIDs while pressing each message center switch (INFO, SETUP, and RESET).
- Does the PID agree with the switch position?
Yes
GO to AH7.
No
GO to AH3.
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AH3 CHECK CIRCUITS 1410 (TN/OG) AND 1411 (GY/OG) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: IC C220.
- Disconnect: Message Center Switch C253.
- Ignition ON.
- Measure the voltage between the IC C220-7, circuit 1410 (TN/OG), harness side and ground; and between the IC C220-6, circuit 1411 (GY/OG), harness side and ground.
- Is any voltage present?
Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
No
GO to AH4.
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AH4 CHECK CIRCUIT 1410 (TN/OG) FOR AN OPEN AND SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the IC C220-7, circuit 1410 (TN/OG), harness side and the message center switch C253-3, circuit 1410 (TN/OG), harness side; and between the IC C220-7, circuit 1410 (TN/OG), 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 AH5.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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AH5 CHECK CIRCUIT 1411 (GY/OG) FOR AN OPEN AND SHORT TO GROUND
- Measure the resistance between the IC C220-6, circuit 1411 (GY/OG), harness side and the message center switch C253-2, circuit 1411 (GY/OG), harness side; and between the IC C220-6, circuit 1411 (GY/OG), 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 AH6.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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AH6 CHECK FOR VOLTAGE FROM THE IC
- Connect: IC C220.
- Ignition ON.
- Measure the voltage between the message center switch C253-3, circuit 1410 (TN/OG), harness side and the message center switch C253-2, circuit 1411 (GY/OG), harness side.
- Is the voltage greater than 10 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 AH7.
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AH7 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. CLEAR the DTCs. REPEAT the self-test.
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