Did you perform the Data Link Communications Diagnostic System Check?

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Go to Step 2

Go to Diagnostic System Check - Data Link Communications

Turn the Ignition Switch to the RUN position.

Does the Malfunction Indicator Lamp (MIL) illuminate?

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Go to Step 3

Go to Powertrain On Board Diagnostic (OBD) System Check

1. From the scan tool's main menu, select Powertrain Diagnostics.
2. Establish communications with the Vehicle Control Module (VCM).

Does the scan tool indicate No Data Communication with Vehicle?

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Go to Step 4

Go to Diagnostic System Check - Data Link Communications

1. From the scan tool's main menu, select Chassis Diagnostics.
2. Establish communications with the Electronic Brake Control Module (EBCM).

Is the scan tool able to communicate with the EBCM?

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Go to Step 5

Go to Diagnostic System Check - Data Link Communications

1. Turn the Ignition Switch to the OFF position.
2. Disconnect connector C4 from the VCM
3. Connect a J 39200 DMM between terminal 11 of connector C4 of the VCM andsplice S150.

Is continuity present?

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Go to Step 7

Go to Step 6

Locate and repair the open or cause of resistance in CKT 1807 (PPL) between splice S150 and terminal 11, connector C4 of the VCM. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

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Go to Diagnostic System Check - Data Link Communications

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Replace the VCM. Refer to VCM Replacement/Programming .

Is the repair complete?

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Go to Diagnostic System Check - Data Link Communications

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