Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the appropriate inoperative headlamp assembly.
- Test for less than 5 Ω between the ground circuit terminal 7 and ground.
- If greater than the specified range, test the ground circuit for an open/high resistance.
- Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 6 and ground. The test lamp should turn ON.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
- Ignition OFF, disconnect the harness connector at the S30 Headlamp Switch.
- Ignition ON, connect a test lamp between the ignition circuit terminal 9 and ground. The test lamp should turn ON.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
- Test for less than 0.3 V between the signal circuit terminal 10 and ground.
- If greater than the specified range, test the signal circuit for a short to voltage.
- Ignition OFF, install a 3 A fused jumper wire between the signal circuit terminal 10 and B+. Check fuse from jumper wire.
- If the fuse is blown, test the signal circuit for a short to ground.
- Disconnect the 3 A fused jumper wire, test for less than 5 Ω between the signal circuit terminal 10 at the S30 Headlamp Switch and the control circuit terminal 8 at the appropriate headlamp assembly.
- If greater than the specified range, test the signal circuit for an open/high resistance.
- Reconnect the harness connector at the S30 Headlamp Switch.
- Ignition ON, test for 2.5-7 V between the control circuit terminal 8 at the appropriate headlamp assembly and ground. Move the switch for headlamp level control between all positions. The voltage should change with each position.
- If the voltage does not change, test or replace the S30 Headlamp Switch.
- If all circuits test normal, replace the appropriate headlamp assembly.