Test 16: ASD Lamp Malfunction

Disconnect Automatic Locking Differential (ASD) control module harness connector. See Figure . Using a jumper wire, ground terminal No. 10 at ASD control module harness connector. Start engine and let idle. If ASD indicator lamp does not illuminate, check wiring and bulb. If wiring and bulb are okay, replace electronic circuit board. If ASD indicator lamp illuminates, repair ASD system.