U0025

U0025-CAN B BUS (-) CIRCUIT LOW





For a complete wiring diagram Consult Diagrams/Electrical.

- When Monitored:
Continuously.

- Set Condition:
The TIPM detects the (D54) CAN B Bus (-) circuit is shorted to ground.





Diagnostic Test

1. TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
With the scan tool, record and erase TIPM DTC's.
Cycle the ignition from on to off 3 times.
Turn the ignition on.
With the scan tool, read active TIPM DTC's.
Does the scan tool display this DTC as active?

Yes

- Go To 2

No

- The conditions that caused this code to set are not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.

2. CHECK THE (D54) CAN B BUS (-) CIRCUIT FOR A SHORT TO GROUND




Turn the ignition off.
Disconnect the Totally Integrated Power Module C3 harness connector.
Measure the resistance between ground and the (D54) CAN B Bus (-) circuit.
Is resistance below 1000.0 ohms?

Yes

- Go To 3

No

- Go To 4

3. (D54) CAN B BUS (-) CIRCUIT SHORTED TO GROUND




Measure the resistance between ground and the (D54) CAN B Bus (-) circuit.
While monitoring the ohmmeter, disconnect each CAN B Bus module one at a time.

NOTE: This is to determine if the short to ground is internal within a module or if the circuit is shorted.

NOTE: Disconnecting an in-line connector can eliminate a module or group of modules from the list of possible causes for this fault. Refer to the wiring diagrams to assist in diagnosis.

Is resistance below 1000.0 ohms with all the CAN B Bus modules disconnected?

Yes

- Repair the (D54) CAN B Bus (-) circuit for a short to ground.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Replace the module that when disconnected the short to ground was eliminated,.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

4. CHECK THE (D55) CAN B BUS (+) CIRCUIT FOR A SHORT TO THE (D54) CAN B BUS (-) CIRCUIT




Measure the resistance between the (D55) CAN B Bus (+) circuit and (D54) CAN B Bus (-) circuit.
Is resistance below 1000.0 ohms?

Yes

- Go To 5

No

- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace the Totally Integrated Power Module.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

5. (D55) CAN B BUS (+) CIRCUIT SHORTED TO THE (D54) CAN B BUS (-) CIRCUIT




Measure the resistance between the (D55) CAN B Bus (+) circuit and (D54) CAN B Bus (-) circuit.
While monitoring the ohmmeter, disconnect each CAN B Bus module one at a time.

NOTE: This is to determine if the short together is internal within a module or if the circuits are shorted together.

NOTE: Disconnecting an in-line connector can eliminate a module or group of modules from the list of possible causes for this fault. Refer to the wiring diagrams to assist in diagnosis.

Is resistance below 1000.0 ohms with all the CAN B Bus modules disconnected?

Yes

- Repair the (D55) CAN B Bus (+) circuit for a short to the (D54) CAN B Bus (-) circuit.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.

No

- Replace the module that when disconnected the short together was eliminated,.
- Perform BODY VERIFICATION TEST - VER 1.Body Verification Test.