Circuit/System Testing

NOTE:

You must perform Circuit/System Verification before Circuit/System Testing.

Ignition OFF
Perform a Battery Inspection/Test on the C1 Battery and C1B Battery - Auxiliary.
- If battery fails the battery test
  Replace the defective battery
- If battery passes the battery test
Ignition OFF, disconnect the X1 harness connector at the K20 Engine Control Module, ignition ON.
Verify a test lamp illuminates between ignition circuit terminal 51 and ground.
- If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF, remove the test lamp.
2. Test for less than 2 Ω in the ignition circuit end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit
  - If less than 2 Ω, refer to Power Mode Mismatch .
- If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF, remove the test lamp.
2. Test for infinite resistance between the ignition circuit and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K20 Engine Control Module.
- If the test lamp illuminates
Test for less than 0.5 V between the C1B Battery - Auxiliary positive terminal and B+ circuit connector X4 terminal 1 at the X50D Fuse Block - Battery with the ignition in the START position.
- If 0.5 V or greater
  Replace C1B Battery - Auxiliary positive cable.
- If less than 0.5 V

CAUTION:

Do not disconnect the K125 Dual Battery Control Module harness connector with the batteries connected. Leaving the module disconnected for an extended period of time can lead to a significant increase in temperature and damage to the module.

Ignition OFF, disconnect the C1 and C1B battery (disconnect negative cable of each battery).
Disconnect the harness connector at the K125 Dual Battery Control Module.
Test for less than 10 Ω between the ground circuit terminal 4 and ground.
- If 10 Ω or greater
1. Test for less than 2 Ω in ground circuit end to end
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, repair the open/high resistance in the ground connection.
- If less than 10 Ω
Disconnect the F18UA 5A fuse.
Test for infinite resistance between the ignition circuit terminal 3 and B+ terminal of the C1 Battery.
- If less than infinite resistance
  Repair the short to voltage on the circuit.
- If infinite resistance
Test for infinite resistance between the ignition circuit terminal 3 and ground.
- If less than infinite resistance
  Repair the short to ground on the circuit.
- If infinite resistance
Test for less than 2 Ω in the ignition circuit end to end.
- If 2 Ω or greater
  Repair the open/high resistance in the circuit.
- If less than 2 Ω
Disconnect the X2 harness connector at the K20 Engine Control Module and disconnect the KR27 Starter Relay.
Test for infinite resistance between the control circuit terminal 2 at the K125 Dual Battery Control Module and B+ terminal of the C1 Battery.
- If less than infinite resistance
  Repair the short to voltage on the circuit.
- If infinite resistance
Test for infinite resistance between the control circuit terminal 2 at the K125 Dual Battery Control Module and ground.
- If less than infinite resistance
  Repair the short to ground on the circuit.
- If infinite resistance
Test for less than 2 Ω in the control circuit end to end.
- If 2 Ω or greater
  Repair the open/high resistance in the circuit.
- If less than 2 Ω
Replace the K125 Dual Battery Control Module.