Pinpoint Test U: The Charging System Warning Indicator Is Never/Always On

Instrumentation, Message Center and Warning Chimes

Pinpoint Tests

Pinpoint Test U: The Charging System Warning Indicator Is Never/Always On

Normal Operation

The PCM constantly monitors the generator regulator output. When the PCM detects a continuous high or low output signal, or when the ignition switch is ON and the engine is OFF, the PCM sends a message over the communication network to the Instrument Cluster (IC) to illuminate the charging system warning indicator. When the ignition switch is in the ON position, with the engine running, and the PCM determines that the set point for the regulator has been met, the PCM sends a message to the IC to turn off the charging system warning indicator.

This pinpoint test is intended to diagnose the following:

- Charging system concern
- PCM
- IC



PINPOINT TEST U: THE CHARGING SYSTEM WARNING INDICATOR IS NEVER/ALWAYS ON

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U1 CARRY OUT THE IC INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL


- Ignition ON.
- Enter the following diagnostic mode on the scan tool: IC DataLogger.
- Select the IC all lamps (ALL_LAMP) active command on while monitoring the charging system warning indicator.
- Is the charging system warning indicator illuminated?

Yes
GO to U2.

No
INSTALL a new IC. REFER to Instrument Cluster (IC) Instrument Cluster (IC). TEST the system for normal operation.

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U2 RETRIEVE THE RECORDED DTCs FROM THE PCM KOEO SELF-TEST


- Check for recorded PCM DTCs from the Key ON Engine OFF (KOEO) self-test.
- Are any charging system DTCs recorded?

Yes
REFER to Charging System.

No
GO to U3.

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U3 CHECK THE CHARGING SYSTEM OPERATION


- Check the charging system operation. Refer to Charging System.
- Does the charging system operate correctly?

Yes
GO to U4.

No
REFER to Charging System.

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U4 RETRIEVE THE RECORDED DTCs FROM THE IC SELF-TEST


- Check for recorded IC DTCs from the self-test.
- Is DTC U0100 recorded?

Yes
Go To Pinpoint Test AN. Pinpoint Tests AN: The Safety Belt Warning Chime Does Not Operate Correctly/The Belt-Minder(R) Feature Does Not Operate Correct

No
INSTALL a new PCM. TEST the system for normal operation.

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