Circuit/System Testing

NOTE:

Circuit/System Verification must be performed before proceeding with Circuit/System Testing.

Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the harness connector at the S27 Head-Up Display Switch. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between the low reference circuit terminal 3 and ground.
- If 10 Ω or greater
1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Display.
2. Test for less than 2 Ω in the low reference circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the P29 Head-Up Display.
- If less than 10 Ω
Test for 4.8 - 5.2 V between the signal circuit terminal 4 and ground.
- If less than 4.8 V
1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the P29 Head-Up Displaye.
2. Test for infinite resistance between the signal circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance
3. Test for less than 2 Ω in the signal circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, replace the P29 Head-Up Display.
- If greater than 5.2 V
1. Ignition OFF/Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, ignition ON.
2. Test for less than 1 V between the signal circuit and ground.
  - If 1 V or greater, repair the short to voltage on the circuit.
  - If less than 1 V, replace the P29 Head-Up Display.
- If between 4.8 - 5.2 V
Test or replace the S27 Head-Up Display switch.