Circuit/System Testing

WARNING: This page is about a different car, the 2016 Chevrolet Malibu Limited. However, it is still accessible from the selected car via links, so may be relevant.

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
Ignition OFF, disconnect the C1 and C1B battery (disconnect negative cable of each battery).
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.
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.