Circuit/System Testing

NOTE:

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

Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the B9 Ambient Air Temperature Sensor. 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 2 and ground.
- If 10 Ω or greater
1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
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 P16 Instrument Cluster.
- Go to next step: If less than 10 Ω
Ignition ON.
Verify the scan tool Ambient Air Temperature parameter is lower than -29°C (-20°F)
- If -29°C (-20°F) or greater
1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster.
2. Test for infinite resistance between the signal circuit terminal 1 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the P16 Instrument Cluster.
- Go to next step: If lower than -29°C (-20°F)
Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
Verify the scan tool Ambient Air Temperature parameter is greater than 57°C (135°F)
- If 57°C (135°F) or lower
1. Ignition OFF, disconnect the harness connector at the P16 Instrument Cluster, 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.
  - Go to next step: If less than 1 V
3. Ignition OFF
4. 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 P16 Instrument Cluster.
- Go to next step: If greater than 57°C (135°F)
Test or replace the B9 Ambient Air Temperature Sensor.