• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

For symptom byte information refer to Symptom Byte List

The body control module (BCM) feeds the ignition circuit by applying voltage when the ignition is in the ON position.

• The system voltage is between 9–16 V.
• The DTC can only run when the output is activated.

A short to ground is detected on the ignition run relay coil control circuit.

The module output driver will be shut down and not supply voltage to the ignition run relay control circuit.

• The current DTC will clear when the module request for the output is removed or the malfunction is no longer present.
• A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction.

Power Moding Schematics

Master Electrical Component List

Power Mode Description and Operation

• Circuit Testing
• Connector Repairs
• Electrical Relay Replacement
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Control Module References for scan tool information

1. Ignition ON.
2. Verify the HVAC control module scan tool Ignition Signal parameter is 12.6-15V.
• If not between 12.6–15 V

  Refer to Circuit/System Testing – Diagnostic A.

• If between 12.6–15 V

Note: The vehicle may not be equipped with the ignition relay below.

3. Verify the KR32E Blower Motor Relay turns ON and OFF when commanding the Auxiliary Ignition Run Relay On and Off with a scan tool.
• If the KR32E Blower Motor Relay does not turn ON and OFF

  Refer to Circuit/System Testing– Diagnostic B.

• If the KR32E Blower Motor Relay turns ON and OFF
4. All OK.

1. Ignition OFF and all vehicle systems OFF, disconnect the X2 harness connector at the K33 HVAC Control Module.
2. Connect a test lamp between the ignition circuit terminals listed below and ground, Ignition ON.
• K33 HVAC Control Module – Ignition circuit terminal 2 (With C67 or C4P)
• K33 HVAC Control Module – Ignition circuit terminal 9 (With CJ2, C41 or C60)
3. 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
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module.
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
3. 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, replace the K9 Body Control Module.
• If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. Test for less than 1 V between the ignition 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.
• If the test lamp turns ON and OFF
4. Replace the K33 HVAC Control Module.

1. 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.
2. Test for less than 10 Ω between the ground circuit terminal 1 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
3. Ignition ON, connect a test lamp between the control circuit terminal 2 and ground circuit terminal 1.
4. 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
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module and K33 HVAC Control Module.
2. Test for infinite resistance between the control circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance
3. 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 appropriate K9 Body Control Module or K33 HVAC Control Module.
• If the test lamp is always ON
1. Ignition OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON.
2. 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.
• If the test lamp turns ON and OFF
5. Test or replace the appropriate KR32E Blower Motor Relay.

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for control module replacement, programming and setup.