Pinpoint Test B: No Power In Run/Acc
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- B1 RETRIEVE THE SJB DTCS
- Connect the diagnostic tool.
- Key in ON position.
- Enter the following diagnostic mode on the diagnostic tool: SJB Self-Test
- Carry out the SJB self-test.
- Record the SJB continuous DTCs.
- Is DTC B1359 or B1555 present?
- B2 CHECK CIRCUIT 297 (BK/LG) FOR AN OPEN OR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280a
- Disconnect: Ignition Switch C250
- Measure the resistance between:
- ignition switch C250-6 circuit 297 (BK/LG), harness side and SJB C2280a-16 circuit 297 (BK/LG), harness side.
- ignition switch C250-6 circuit 297 (BK/LG), harness side and ground.
- Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground?
- YES : Go to B4.
- NO : REPAIR circuit 297 (BK/LG). CLEAR the DTCs. REPEAT the self-test.
- B3 CHECK CIRCUIT 1050 (LG/VT) FOR AN OPEN OR A SHORT TO GROUND
- Key in OFF position.
- Disconnect: SJB C2280a
- Disconnect: Ignition Switch C250
- Measure the resistance between:
- ignition switch C250-1 circuit 1050 (LG/VT), harness side and SJB C2280a-7 circuit 1050 (LG/VT), harness side.
- ignition switch C250-1 circuit 1050 (LG/VT), harness side and ground.
- Is the resistance less than 5 ohms between the components, and greater than 10,000 ohms to ground?
- YES : Go to B4.
- NO : REPAIR circuit 1050 (LG/VT). CLEAR the DTCs. REPEAT the self-test.
- B4 CHECK THE IGNITION SWITCH
- Disconnect: Ignition Switch C250
- Carry out the Ignition Switch Component Test. Refer to COMPONENT TESTING article.
- Is the ignition switch OK?
- YES : Go to B5.
- NO : INSTALL a new ignition switch. REFER to Ignition Switch . CLEAR the DTCs. REPEAT the self-test.
- B5 CHECK FOR CORRECT SJB OPERATION
- Disconnect all the SJB connectors.
- Check for:
- corrosion.
- pushed-out pins.
- spread terminals.
- 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 article.
- 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 self-test.