Did you perform the Data Link Communications System Check?

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Go to Step 2

Go to Diagnostic System Check - Data Link Communications

1. Locate an identical vehicle with the same systems.
2. Connect the scan tool to the second vehicles DLC.
3. Establish communications with the second vehicle.

Can coomunications be established?

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Go to Step 3

Go to scan tools owners manual.

1. Disconnect the scan tool from the secondary vehicle.
2. Ensure the ignition switch is in the OFF position on the original vehicle.
3. Connect a testlamp between terminals 16 of the DLC and ground on the original vehicle.

Does the testlamp light?

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Go to Step 4

Go to Step 6

Connect the testlamp between terminals 16 and 4, and then 16 and 5 of the DLC.

Does the testlamp light?

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Go to Step 5

Go to Step 7

Inspect the power and ground circuits of the DLC for intermittents and poor connections. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Is the repair complete?

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Go to Diagnostic System Check - Data Link Communications

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Locate and repair the open in CKT 840 (ORN) between the AUX PWR fuse and the DLC. 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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Locate and repair the open in CKT 150 (BLK) or CKT 451 (BLK/WHT) between the DLC and ground. 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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