Using Voltmeter
Turn ignition switch to OFF position. Connect Data Link Connector (DLC) adapter (MB991529) to DLC terminal No. 4 or 5 and terminal No. 9. See Fig 1. Connect analog voltmeter to adapter. Operate specified switches and observe voltmeter operation. See INPUT SIGNAL INDEX table. If input signal is sent to DLC, voltmeter needle will deflect once. If any circuit fails to operate properly, repair by symptom. See SYMPTOM INDEX table under SYMPTOM TESTS.
INPUT SIGNAL INDEX
| Switch | Required Operation |
|---|---|
| Door Switches | Open Any Door When All Doors Are Closed |
| Driver's Door Lock Actuator Switch | Turn Key To LOCK Or UNLOCK Position |
| Hood Switch | Open Hood |