Pinpoint Test D: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

Communications Network

Pinpoint Tests

Pinpoint Test D: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

Refer to Wiring Diagram Set 13, Power Distribution/SJB for schematic and connector information. Diagrams By Number

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number

Normal Operation

The Smart Junction Box (SJB) communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- SJB



PINPOINT TEST D: THE SJB DOES NOT RESPOND TO THE SCAN TOOL

NOTICE: Use the correct probe adapter(s) when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.

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D1 CHECK THE SJB FUSE FOR AN OPEN


- Disconnect: SJB Fuse 11 (10A).
- Inspect the fuse for an open.




- Is the fuse open (blown)?

Yes
REFER to the Wiring Diagrams to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool. Diagrams By Number

No
GO to D2.

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D2 CHECK THE SJB GROUND CIRCUIT FOR AN OPEN


- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Disconnect: SJB C2280c.
- Measure the resistance between the SJB C2280c-1, circuit GD174 (BK/WH), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to D3.

No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

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D3 CHECK THE HS-CAN CIRCUITS BETWEEN THE SJB AND THE DLC FOR AN OPEN


- Disconnect: SJB C2280d.
- Measure the resistance between the SJB C2280d-20, circuit VDB04 (WH/BU), harness side and the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side.




- Measure the resistance between the SJB C2280d-21, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side.




- Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to D4.

No
REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

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D4 CHECK FOR CORRECT SJB OPERATION


- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new SJB. REFER to Body Control Systems. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

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