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Ask Jared D Your Own Question
Jared D
Jared D, ASE Certified Technician
Category: Ford
Satisfied Customers: 1349
Experience:  Shop Supervisor at County Fleet
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Wind shield wipers start when I start the engine four wheel

Customer Question

wind shield wipers start when I start the engine four wheel drive dosent work all fuses are ok
JA: Have you checked the fuses? Do you know if there is power to the wiper motor?
Customer: yes
JA: What is the model/year of your Ford?
Customer: yes
JA: What year is your Ford?
Customer: 1997 f150 larado
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: yes checked fuses
JA: Anything else you think the mechanic should know?
Customer: gem modual ????
Submitted: 3 months ago.
Category: Ford
Expert:  Jared D replied 3 months ago.

I would suspect the GEM. If you have a multi-meter you should check the following:

Verify that fuses 6, 8, 15 and 20 are all in place and are not blown.

Turn the key on and verify power on both sides of the fuses. Fuse 20 is only hot when the key is in the start position.

If OK, check the grounds at pins 14 and 26 of C239 and pin 9 of C242.

If the power and grounds check out OK, unplug the GEM module from the back of the Central Junction Box (CJB) and check for signs of corrosion at C267 that is sandwiched in between the CJB and the GEM module. If corrosion is found, replace both components and retest.

If no corrosion is found and the power and grounds test out OK, check for an open or grounded International Standards Organization (ISO) communications wire from pin 25 Light Blue/White (LB/WH) of C239 to the Data Link Connector (DLC). If OK, replace the GEM module and retest.

Expert:  Jared D replied 3 months ago.

Good morning,

I just wanted to check and see if you need additional help with this. If not please don't forget to rate.