RAM 1500 Van V8-5.2L CNG VIN T (1999)
Headlamp Relay: Testing and Inspection
The headlamp (or security) relay is taped to the headlamp switch takeout of the instrument panel wire harness, and the horn relay is located in the
junction block on the driver side end of the instrument panel. Each of these relays can be tested as described in the following procedure, however the
circuits they are used in do vary.
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE
ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE.
FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
TESTING
Remove the headlamp relay to perform the following tests.
See: Service and Repair
Relay Terminals
1. A relay in the de-energized position should have continuity between terminals 87A and 30, and no continuity between terminals 87 and 30. If OK,
go to Step 2. If not OK, replace the faulty relay
2. Resistance between terminals 85 and 86 (electromagnet) should be 75 ± 5 ohms. If OK, go to Step 3. If not OK, replace the faulty relay.
3. Connect a battery to terminals 85 and 86. There should now be continuity between terminals 30 and 87, and no continuity between terminals 87A
and 30. If OK, test the relay circuits. If not OK, replace the faulty relay.
