TSB : Circuit/System Testing

Details

Ignition OFF and all vehicle systems OFF, disconnect the KR32E Blower Motor Relay. It may take up to 2 min for all vehicle systems to power down. Test for less than 10 Ω between the ground circuit terminal 1 and ground. If 10 Ω or greater Ignition OFF. 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. Go to next step: If less than 10 Ω Ignition ON, connect a test lamp between the control circuit terminal 2 and ground circuit terminal 1. Verify the test lamp turns ON and OFF when commanding the Auxiliary Ignition Run Relay On and Off with a scan tool. If the test lamp is always OFF Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module. Test for infinite resistance between the control circuit and ground. If less than infinite resistance, repair the short to ground on the circuit. Go to next step: 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 K9 Body Control Module. If the test lamp is always ON Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON. Test for less than 1 V between the control circuit and ground. If 1 V or greater, repair the short to voltage on the circuit. If less than 1 V, replace the K9 Body Control Module. Go to next step: If the test lamp turns ON and OFF Test or replace the KR32E Blower Motor Relay.