Pinpoint Test C: The Smart Junction Box (SJB) Does Not Respond To The Diagnostic Tool
WARNING: This page is about a different car, the 2005 Mercury Sable and 2005 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
- C1 CHECK SJB C2280C FOR DAMAGE
- Key in OFF position.
- Disconnect: SJB C2280c.
- Is the SJB C2280C OK?
- Yes : GO to C2.
- No : REPAIR the SJB C2280c. CARRY OUT the diagnostic tool data link test.
- C2 CHECK MEDIUM SPEED CAN CIRCUITS 1827 (WH/LG) AND 1828 (PK/LG) BETWEEN DLC C251 AND SJB C2280c FOR OPEN
- Measure the resistance between the SJB C2280c pin 9, circuit 1827 (WH/LG), harness side and the DLC C251 pin 3, circuit 1827 (WH/LG), harness side; and between the SJB C2280c pin 10, circuit 1828 (PK/LG), harness side and the DLC C251 pin 11, circuit 1828 (PK/LG), harness side.
- Are the resistances less than 5 ohms?
- Yes : GO to C3.
- No : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
- C3 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion
- pushed-out pins
- Connect all the SJB module 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 MULTIFUNCTION ELECTRONIC MODULES . CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test. CARRY OUT the diagnostic tool data link test.