U0020-CAN INTERIOR BUS OFF PERFORMANCE
For a complete wiring diagram Refer to Section 8W.
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When Monitored:
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Continuously.
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Set Condition:
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Whenever the CAN INTERIOR BUS (+) or INTERIOR BUS (–) circuit is open, shorted to voltage or shorted to ground, this code will set.
Possible Causes
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CAN INTERIOR BUS DTCs IN THE TOTALLY INTEGRATED POWER MODULE
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(D264) CAN INTERIOR BUS (–) CIRCUIT OPEN
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(D265) CAN INTERIOR BUS (+) CIRCUIT OPEN
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AMPLIFIER
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Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase DTCs.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read DTCs.
Does the scan tool display: U0020-CAN INTERIOR BUS OFF PERFORMANCE?
Yes
No
2.
CHECK FRONT CONTROL MODULE DTCs
With the scan tool, read Totally Integrated Power Module DTCs.
Does the scan tool display any CAN INTERIOR BUS DTCs – ACTIVE?
Yes
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Refer to the symptom list for problems related to Communication in the ELECTRICAL.– ELECTRONIC CONTROL MODULES – ELECTRICAL DIAGNOSES section.
No
3.
CAN INTERIOR BUS (+) CIRCUIT OPEN
Turn the ignition off.
Disconnect the Amplifier C1 harness connector.
Disconnect the Totally Integrated Power Module C7 harness connector.
Measure the resistance of the (D265) CAN INTERIOR BUS (+) circuit between the Totally Integrated Power module C7 harness connector and the Amplifier C1 harness connector.
Is the resistance below 2.0 ohms?
Yes
No
4.
CAN INTERIOR BUS (–) CIRCUIT OPEN
Measure the resistance of the (D264) CAN INTERIOR BUS (–) circuit between the Totally Integrated Power Module C7 harness connector and the Amplifier C1 harness connector.
Is the resistance below 2.0 ohms?
Yes
No