Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

TEST FOR INTERMITTENT CONDITION
NOTE:
Check for any TSB(s) related to the condition. If a TSB applies, perform the procedure outlined in the TSB before continuing.
1. Turn the ignition on.
  NOTE:
  Make sure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
2. With the scan tool, read the module status.
  NOTE:
  Check the BCM for any active CAN DTCs and perform the appropriate diagnostics before proceeding. Refer to the DTC INDEX article .
  
  Does the scan tool indicate that the module is active on the bus?
  
  Yes
  - Perform the STORED LOST COMMUNICATION DTCS diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .
  No
  - Go To 2
CHECK THE (A917) FUSED FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
1. Disconnect the RBC harness connector.
2. Using a 12-volt test light connected to ground, check the (F960) Fused Ignition Switch Output (Run-Start) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the (F917) Fused B(+)) circuit for an open or short.
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (A918) FUSED FUSED B(+) CIRCUIT FOR AN OPEN OR SHORT
1. Using a 12-volt test light connected to ground, check the (F918) Fused Ignition Switch Output (Run-Start) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 4
  No
  - Repair the (F918) Fused B(+)) circuit for an open or short.
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (F960) FUSED IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT FOR AN OPEN OR SHORT
1. Using a 12-volt test light connected to ground, check the (F960) Fused Ignition Switch Output (Run-Start) circuit.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 5
  No
  - Repair the (F960) Fused Ignition Switch Output (Run-Start) circuit for an open or short.
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (Z708) GROUND CIRCUITS FOR AN OPEN
1. Turn the ignition off.
2. Using a 12-volt test light connected to 12-volts, check the (Z708) Ground circuits.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 6
  No
  - Repair the (Z708) Ground circuits for an open.
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D445) CAN C(+) BUS CIRCUIT FOR AN OPEN
1. Disconnect the Dynamics Sensor harness connector.
2. Measure the resistance of the (D445) CAN C Bus (+) circuit between the Dynamics Sensor harness connector and the RBC harness connector.
  Is the resistances below 5.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (D445) CAN C(+) Bus circuit for an open.
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D444) CAN C(-) BUS CIRCUIT FOR AN OPEN
1. Measure the resistance of the (D444) CAN C Bus (-) circuit between the Dynamics Sensor harness connector and the RBC harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Repair the (D444) CAN C(-) Bus circuit for an open.
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D79) CAN C(+) BUS CIRCUIT FOR AN OPEN
1. Disconnect the Anti-lock Brake System (ABS) Module harness connector.
2. Measure the resistance of the (D79) CAN C Bus (+) circuit between the RBC harness connector and the ABS Module harness connector.
  Is the resistances below 5.0 Ohms?
  
  Yes
  - Go To 9
  No
  - Repair the (D79) CAN C(+) Bus circuit for an open.
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
CHECK THE (D80) CAN C(-) BUS CIRCUIT FOR AN OPEN
1. Measure the resistance of the (D80) CAN C Bus (-) circuit between the RBC harness connector and the ABS Module harness connector.
  Are the resistances below 5.0 Ohms?
  
  Yes
  - Replace and Program the Regenerative Brake Controller (RBC) in accordance with service information. Refer to CONTROLLER, REGENERATIVE BRAKE (RBC), REMOVAL .
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Repair the (D80) CAN C(-) Bus circuit for an open.
  - Perform the RBC VERIFICATION TEST. Refer to STANDARD PROCEDURE .