U0018

U0018 - Can Interior Bus (-) Circuit Shorted To Bus (+)

For a complete wiring diagram, refer to.

• When Monitored: Continuously.

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






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 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 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 a Short to CAN C Interior Bus (+) ]

Test Step 3 - Check CAN C Interior Bus (-) Circuit for a Short to CAN C Interior Bus (+)

• 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 between CAN C Interior Bus 125K (-) circuit and the CAN C Interior Bus 125K (+) circuit in the A/C heater control (3 ZONE ATC) 32 way harness connector.

Is the resistance more than 1000.0 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 a short to the CAN C Interior Bus 125K (+).

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