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Inspection and Verification (Start Testing Here)

NOTE: The FEM and instrument cluster must be reconfigured upon replacement. Refer to Information Bus.

1. Verify the customer concern by operating the horn.
2. Visually inspect for the following obvious signs of mechanical and electrical damage.

VISUAL INSPECTION CHART

Mechanical
^ Damaged horn
^ Damaged horn switch
^ Damaged horn relay

Electrical
^ Blown battery junction box
- Fuse 4 (25 A)
^ Blown central junction box Fuses:
- Fuse 9 (10 A)
- Fuse 14 (10 A)
- Fuse 16 (10 A)
- Fuse 28 (10 A)
^ Damaged wiring harness
^ Damaged horn relay
^ Loose or corroded connections

3. If the concern remains after the inspection, connect the New Generation STAR (NGS) Tester to the data link connector located beneath the instrument panel and select the vehicle to be tested from the NGS menu. If the NGS does not communicate with the vehicle:
^ check that the program card is correctly installed.
^ check the connections to the vehicle.
^ check the ignition switch position.

4. If the NGS still does not communicate with the vehicle, refer to the NGS Tester manual.
5. Carry out the DATA LINK DIAGNOSTIC TEST. If the NGS responds with:
^ CKT914, CKT915 or CKT7O = ALL ECUS NO RESP/NOT EQUIP, refer to Information Bus.
^ NO RESP/NOT EQUIP for instrument cluster, GO to Pinpoint Test A. Test A: No Communication With the Instrument Cluster
^ NO RESP/NOT EQUIP for FEM, GO to Pinpoint Test B. Test B: No Communication With the Front Electronics Module
^ SYSTEM PASSED, retrieve and record the continuous Diagnostic Trouble Codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the Instrument Cluster (IC) and Front Electronics Module (FEM).

6. If the DTCs retrieved are related to the concern, go to the IC DTC Index Instrument Cluster Diagnostic Trouble Code Index
or go to the FEM DTC Index to continue diagnostics. FEM Diagnostic Trouble Code Index
7. If no DTCs related to the concern are retrieved, proceed to Symptom Chart to continue diagnostics. Symptom Related Diagnostic Procedures
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