Pinpoint Tests AD: The Message Center Is Not Operating Correctly

Instrumentation, Message Center and Warning Chimes

Pinpoint Test AD: The Message Center Is Not Operating Correctly

Normal Operation

The message center functionality is controlled through the message center switch. The RESET and SETUP buttons are hardwired to the Instrument Cluster (IC) through circuit 143 (LB/YE). The INFO and SELECT buttons are hardwired to the IC through circuit 152 (LB/WH). The message center switch return is routed back to the IC through circuit 1411 (GY/OG). Each message center switch uses a different resistance value allowing the IC to determine which switch is pressed.

B1205-B1212:

This pinpoint test is intended to diagnose the following:

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



PINPOINT TEST AD: THE MESSAGE CENTER IS NOT OPERATING CORRECTLY

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AD1 CHECK THE MESSAGE CENTER DISPLAY OPERATION USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC display (SEGMENTS_2) active command on and off. Observe the message center display.
- Does the message center display illuminate all segments?

Yes
GO to AD2.

No
GO to AD8.

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AD2 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Retrieve the recorded IC DTCs from the self-test.
- Are any DTCs retrieved?

Yes
For DTC B1205 or DTC B1209, CLEAR the DTCs. REPEAT the self-test. If DTC B1205 or DTC B1209 is still present, INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement.

For DTC B1208 or DTC B1212, GO to AD3.

For DTC B1206 or DTC B1210, GO to AD5.

No
GO to AD7.

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AD3 CHECK CIRCUITS 143 (LB/YE), 152 (LB/WH) AND 1411 (GY/OG) FOR A SHORT BETWEEN THE CIRCUITS


- Ignition OFF.
- Disconnect: IC C2220.
- Disconnect: Message Center Switch C253.
- Measure the resistance between the message center switch C253-5, circuit 143 (LB/YE), harness side and the message center switch C253-4, circuit 1411 (GY/OG), harness side; and between the message center switch C253-6, circuit 152 (LB/WH), harness side and the message center switch C253-4, circuit 1411 (GY/OG), harness side.




- Are the resistances greater than 10,000 ohms?

Yes
GO to AD4.

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

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AD4 CHECK THE MESSAGE CENTER SWITCH CIRCUITS FOR A SHORT TO GROUND


- Ignition OFF.
- Measure the resistance between the message center switch, harness side and ground as follows:









- Are the resistances greater than 10,000?

Yes
GO to AD8.

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

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AD5 CHECK THE MESSAGE CENTER SWITCH CIRCUITS FOR A SHORT TO VOLTAGE


- Ignition OFF.
- Disconnect: IC C2220.
- Disconnect: Message Center Switch C253.
- Ignition ON.
- Measure the voltage between the message center switch harness side and ground as follows:









- Is any voltage present?

Yes
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.

No
GO to AD6.

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AD6 CHECK THE MESSAGE CENTER SWITCH CIRCUITS FOR AN OPEN


- Ignition OFF.
- Measure the resistance between the IC , harness side and the message center switch, harness side as follows:









- Are the resistances less than 5 ohms?

Yes
GO to AD7.

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

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AD7 CHECK THE MESSAGE CENTER SWITCHES


- Ignition OFF.
- Disconnect: IC C2220 (If Directed Here From Test Step AD2).
- Connect: IC C2220 (If Directed Here From Test Step AD6).
- Measure the resistance between the IC connector harness side as follows:





- Are the resistance values within the specifications?

Yes
GO to AD8.

No
INSTALL a new message center switch. REFER to Message Center Switch Removal and Replacement. CLEAR the DTCs. REPEAT the self-test.

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AD8 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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