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

Communications Network

Pinpoint Tests

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

Refer to Wiring Diagram Set 10, Grounds for schematic and connector information. Diagrams By Number

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 Medium Speed Controller Area Network (MS-CAN).

This pinpoint test is intended to diagnose the following:

- Fuse
- Wiring, terminals or connectors
- SJB



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

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

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H1 CHECK THE SJB FUSE FOR VOLTAGE


- Ignition OFF.
- NOTE: Measurements are taken with the fuses installed.
- Measure the voltage between the SJB fuse 2 (5A) and ground.




- Are the voltages greater than 10 volts?

Yes
GO to H3.

No
VERIFY the Smart Junction Box (SJB) fuse 2 (5A) is OK. If OK, GO to H2. If not OK, 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

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H2 CHECK THE SJB VOLTAGE SUPPLY CIRCUIT FOR AN OPEN


- Disconnect: SJB C2280e.
- Measure the voltage between the SJB C2280e-1, circuit SBB03 (BU/RD), harness side and ground.




- Is the voltage greater than 10 volts?

Yes
GO to H5.

No
VERIFY the Battery Junction Box (BJB) fuse 3 (50A) is OK. If OK, REPAIR the circuit. If not OK, 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

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H3 CHECK THE SJB GROUND CIRCUIT FOR AN OPEN


- Disconnect: Negative Battery Cable.
- Disconnect: SJB C2280e.
- Measure the resistance between the SJB C2280e-22, circuit GD108 (BK/VT), harness side and ground.




- Is the resistance less than 5 ohms?

Yes
GO to H4.

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

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H4 CHECK THE MS-CAN CIRCUITS BETWEEN THE SJB AND THE DLC FOR AN OPEN


- Disconnect: SJB C2280d.
- Measure the resistance between the SJB C2280d-16, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side.




- Measure the resistance between the SJB C2280d-15, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side.




- Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to H5.

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

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H5 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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