Initial Inspection

INSPECTION AND VERIFICATION

1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of electrical damage.

VISUAL INSPECTION CHART

Electrical
- Battery junction box (BJB) fuse 114 (30A)
- Central junction box (CJB) fuse 16 (15A)
- Wiring harness
- Connector(s)
- Circuitry
- Air suspension module

3. If the concern remains after the inspection, connect the diagnostic tool to the data link connector (DLC) located beneath the instrument panel and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition position.

4. If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool manual.
5. Carry out the DATA LINK DIAGNOSTICS test. If the diagnostic tool responds with:
- CKT914, CKT915 or CKT70 = ALL ECUS NO RESP/NOT EQUIP, refer to Module Communications Network (Information Bus)
- NO RESPONSE/NOT EQUIP for AIR SUSP, GO to Pinpoint Test A. Pinpoint Tests
- SYSTEM PASSED, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs and carry out self-test diagnostics for the ASM.

6. If the DTCs retrieved are related to the concern, go to the Diagnostic Trouble Code Chart to continue diagnostics. Multifunction Electronic Modules
7. If no DTCs related to the concern are retrieved, refer to the appropriate vehicle system to continue diagnostics.