Circuit/System Testing

NOTE:

Some control module ground circuits may require up to 20 min after the ignition is turned off before achieving a resistance reading of less than 5 Ω. In most cases the readings will drop below 20 Ω between 1 min indicating the control module is going to sleep.

Ignition OFF and all vehicle systems OFF, disconnect all harness connectors at the K9 Body Control Module. It may take up to 2 min for all vehicle systems to power down.
Test for less than 10 Ω between each ground circuit terminal and ground.
- If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the 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
Connect all harness connectors at the K9 Body Control Module, except X2
Ignition ON, engine running.
Test for 6-18 V between the B+ circuit terminal A X2 and ground.
- If less than 6 V and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 Ω in battery positive voltage circuit terminal A X2 end to end.
  - If 2 Ω or greater, repair the open/high resistance in the circuit.
  - If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
- If less than 6 V and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between battery positive voltage circuit terminal A X2 and ground.
  - If less than infinite resistance, repair the short to ground on the circuit.
  - If infinite resistance, replace the K9 Body Control Module.
- If 18 V or greater
1. Ignition OFF.
2. Refer to Charging System Test .
- If between 6-18 V and DTC is set
Replace the K9 Body Control Module.