Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the S78 turn signal/multi-function switch.
- Ignition ON, test for greater than 4.8 V between the harness connector signal circuit terminal 5 and ground.
- If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal replace the P16 instrument cluster.
- Test for greater than 11 V between the signal S78 turn signal/multi-function switch circuit terminal 12 and ground.
- If not within the specified range, test the signal for an open/high resistance or a short to ground. If the circuit tests normal replace the P16 instrument cluster.
- Install a 5 A fused jumper wire between the signal S78 turn signal/multi-function switch circuit terminal 12 and the low reference circuit terminal 6. Verify the scan tool Driver Information Center Switch parameter displays 0 V.
- If not the specified value, test the low reference circuit for an open/high resistance. If the circuit tests normal replace the P16 instrument cluster.
- If all circuits tests normal, replace the S78 turn signal/multi-function switch.