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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 123 (Body Control Module (BCM) - DTCS B1812-2A To U1433-24) >> DTC Troubleshooting >> U0010-00-Can Interior Bus >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Dodge Journey and 2015 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN ACTIVE DTC 
    1. Turn the ignition on.
    2. With the scan tool, read the Body Control Module (BCM) DTCs and record on the repair order.
    3. With the scan tool, erase the BCM DTCs.
    4. Turn the ignition on and wait 5 seconds.
    5. With the scan tool, read the BCM DTCs.

      Did the DTC return?

      Yes 

      • Go To  2

      No 

      • The condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension. If no problems are found, test complete.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  2. CHECK THE CAN IHS BUS CIRCUITS FOR THE CAN IHS BUS (125K) MODULES 
    NOTE:

    When performing this step, turn the ignition off (wait one minute) before disconnecting any module. When the module is disconnected turn the ignition on.

    NOTE:

    This step is to determine if the fault is a module or the circuits between the module and the Star Connector.

    1. While monitoring the scan tool, disconnect each CAN IHS Bus (125K) module at the Front CAN IHS Star Connector (except for the BCM and DLC), one at a time.
    2. Check for this DTC to become stored after disconnecting each CAN IHS Bus (125K) module the vehicle is equipped with.
      NOTE:

      If the DTC becomes stored when a particular module is disconnected, that module or related circuits are causing the DTC to set.

      With all the CAN IHS Bus modules disconnected at the Star Connector (except for BCM and DLC), does the scan tool display this DTC as active?

      Yes 

      • Go To  3

      No 

      • Diagnose the wiring and connectors between the Front CAN IHS Star Connector and the module that when disconnected caused this DTC to become stored for damage or shorted circuits. If OK, replace the module that when disconnected caused this DTC to become stored in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  3. CHECK THE (D158) CAN IHS BUS (125K) (-) CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the scan tool.
    3. Disconnect the Front CAN IHS Star Connector for the DLC.
    4. Turn the ignition on.
    5. Measure the voltage between ground and the (D158) CAN IHS Bus (125K) (-) circuit at the Data Link Connector (DLC), terminal 11.

      Is there any voltage present?

      Yes 

      • Repair the short to voltage in the (D158) CAN IHS Bus (-) circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  4
  4. CHECK THE (D157) CAN IHS BUS (125K) (+) CIRCUIT FOR A SHORT TO GROUND 
    1. Turn the ignition off.
    2. Check for continuity between ground and the (D157) CAN IHS Bus (125K) (+) circuit at the Data Link Connector (DLC), terminal 3.

      Is there continuity between ground and the (D157) CAN IHS Bus (125K) (+) circuit?

      Yes 

      • Repair the short to ground in the (D157) CAN IHS Bus (125K) (+) circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK FOR A SHORT BETWEEN THE (D157) CAN IHS BUS (125K) (+) CIRCUIT AND (D158) CAN IHS BUS (125K) (-) CIRCUIT 
    1. Check for continuity between the (D158) CAN IHS Bus (125K) (-) circuit and the (D157) CAN IHS Bus (125K) (+) circuit at the DLC, terminals 3 and 11.

      Is there continuity between the (D158) CAN IHS Bus (125K) (-) circuit and the (D157) CAN IHS Bus (125K) (+) circuit?

      Yes 

      • Go To  6

      No 

      • Repair the short between the (D157) CAN IHS Bus (125K) (+) circuit and the (D158) CAN IHS Bus (125K) (-) circuit.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  6. CHECK THE CAN IHS BUS CIRCUITS FOR BCM 
    1. Reconnect all connectors.
    2. Disconnect the Front CAN IHS Star Connector for the BCM.
    3. Turn the ignition on and wait 5 seconds.
    4. With the scan tool, read all DTCs.

      Do any modules on the CAN IHS BUS (125K) display this DTC as active?

      Yes 

      • Reconnect all the connectors and retest. If the concern is still present, replace the Star Connector.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Diagnose the wiring and connectors between the Front CAN IHS Star Connector and the BCM. If no problems are found, replace the Body Control Module (BCM) in accordance with the Service Information. Refer to MODULE, BODY CONTROL, REMOVAL .
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
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