U0012

U0012 - Can Interior Bus (+) Circuit Open

For a complete wiring diagram, refer to.

• When Monitored: Continuously

• Set Condition: If the CAN C Interior Bus 125K (+) circuit is open.






Test Step 1 - Verify the DTC is Active

• Turn the ignition ON.

• With the scan tool, read HVAC DTCs.

Does the scan tool display this DTC as active?

Yes

• Go to Test Step 2 => [ Test Step 2 - Check
for an Active CAN Interior Bus Related DTCs in the Totally Integrated
Power Module ]

No

• If the DTC is stored, check for an intermittent condition by inspecting the related wiring harness for chafed, pierced, pinched, and partially broken wires. Also, inspect the related connectors for broken, bent, pushed out, spread, corroded, or contaminated terminals.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

Test Step 2 - Check for an Active CAN Interior Bus Related DTCs in the Totally Integrated Power Module

• With the scan tool, read totally integrated power module DTCs.

Does the scan tool display any active CAN Bus related DTCs?

Yes

• Diagnose and repair the DTCs before proceeding with this test. Refer to => Non-DTC Based Diagnostics. for the diagnostic test procedure.

No

• Go to Test Step 3 => [ Test Step 3 - Check
CAN C Interior Bus (+) Circuit for an Open ]

Test Step 3 - Check CAN C Interior Bus (+) Circuit for an Open

• Turn the ignition OFF.

• Disconnect the negative battery cable.

• Disconnect the A/C heater control (3 ZONE ATC) 32 way harness connector.

• Disconnect the totally integrated power module C7 harness connector.

• Measure the resistance of the CAN C Interior Bus 125K (+) circuit between the totally integrated power module C7 harness connector and the A/C heater control (3 ZONE ATC) 32 way harness connector.

Is the resistance less than 2.0 ohms?

Yes

• Replace the A/C heater control.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior

No

• Repair the CAN C Interior Bus (+) circuit for an open.

• Perform the Body Verification Test. Refer to => Non-DTC Based Diagnostics. Body Interior