Pinpoint Test C: DTC B1520
WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- C1 CHECK THE HOOD SWITCH
- Disconnect: Hood Switch C127.
- Connect a fused jumper wire between the hood switch C127-1, circuit CPL25 (BU/OG), harness side and the hood switch C127-2, circuit GD123 (BK/GY), harness side.
- Clear the SJB DTCs.
- Repeat the SJB self-test.
- Is the SJB DTC B1520 retrieved?
- Yes : REMOVE the jumper wire. GO to C2.
- No : REMOVE the jumper wire. INSTALL a new hood switch. TEST the system for normal operation.
- C2 CHECK THE HOOD SWITCH GROUND CIRCUIT FOR AN OPEN
- Measure the resistance between the hood switch C127-2, circuit GD123 (BK/GY), harness side and ground.
- Is the resistance less than 5 ohms?
- Yes : GO to C3.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
- C3 CHECK THE HOOD SWITCH SENSE CIRCUIT FOR AN OPEN
- Disconnect: SJB C2280F.
- Measure the resistance between the SJB C2280F-10, circuit CPL25 (BU/OG), harness side and the hood switch C127-1, circuit CPL25 (BU/OG), harness side.
- Is the resistance less than 5 ohms?
- Yes : GO to C4.
- No : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
- C4 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 MULTIFUNCTION ELECTRONIC MODULES . REPEAT the self-test. TEST the system for normal operation.
- No : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.