For some reason my compass is 180 degrees off, i have calibrated it drove in circles like ur supposed to and even tried a brand new one from the dealer with no luck. North reads south,west reads east and vice versa, any ideas what could be causing this?

 

The service manual says to try demagnetizing your truck as a first step. But if that doesn't work to replace the compass module like you did. Here is what i found:

The compass is inaccurate-
Circuitry
Zone setting
Calibration
Vehicle magnetization
Compass sensor module
Go To Pinpoint Test C -->>

-->>PINPOINT TEST C: THE COMPASS IS INACCURATE
Test Step Result / Action to Take
C1 DEMAGNETIZE THE VEHICLE
Demagnetize the vehicle. Refer to Vehicle Demagnetizing in this section.
Does the compass calibrate correctly?
Yes
GO to C2 .

No
INSTALL a new compass sensor module. SET the zone. REFER to Compass Zone Adjustment in this section. CALIBRATE the compass. REFER to Compass Calibration in this section. TEST the system for normal operation.


C2 CHECK COMPASS ACCURACY
Observe the compass display as follows:

Direction Compass Display
North N
Northeast NE
East E
Southeast SE
South S
Southwest SW
West W
Northwest NW


Does the compass display as indicated?
Yes
The compass is OK. The concern may have been caused by a magnetized vehicle.

No
INSTALL a new compass sensor module. SET the zone. REFER to Compass Zone Adjustment in this section. CALIBRATE the compass. REFER to Compass Calibration in this section. TEST the system for normal operation.


Here is more info on what they suggest for vehicle demagnetizing:
Vehicle Demagnetizing
CAUTION: During demagnetizing, the demagnetizer coil will be pulled toward the vehicle. Place a cloth over the vehicle roof to protect the vehicle surface if contact occurs. Make sure the cloth covers the front third and the entire width of the roof.

NOTE: The demagnetizing process requires the use of a demagnetizing coil commonly used by television repair technicians to demagnetize television tubes.

NOTE: To demagnetize, use a constant circular motion over the vehicle roof. Do not turn off the demagnetizer while sweeping the vehicle roof to prevent remagnetizing ferrous materials contained in the vehicle.

NOTE: During the demagnetizing process, make sure the phenolic surface of the tool (the side opposite the handle) is closest to the vehicle surface.

Demagnetize the front third of the vehicle roof.
Turn on the demagnetizer at least 1 m (3 ft) away from the vehicle.
Holding the demagnetizer no more than 2.5 cm (1 inch) from the vehicle roof and starting on the passenger side, demagnetize the front third of the vehicle roof closest to the windshield using a constant circular motion. Keep the circle radius within 30 cm (12 inches) while sweeping across the entire surface of the vehicle roof closest to the windshield. Continue the circular motion four times.
After the fourth pass and without stopping, move the demagnetizer at least 1 m (3 ft) away from the vehicle.
Turn the demagnetizer off.
Carry out the Compass Zone Adjustment procedure. Refer to Compass Zone Adjustment in this section.
Carry out the Compass Calibration Adjustment procedure. Refer to Compass Calibration in this section.


I doubt your truck is magnetized but you never know. I'm sure someone else had this happen before. Do you have a gps or radar detector or EZ pass toll thing on the windshield near the mirror? That COULD be messing with it but again I doubt it.

 

Thks for the info, i dont have any items such as a radar detector inside the truck that could be causing this, i guess i could try to demagnetize it like u suggested.

 

Ive seen people mount it backwards on the mirror.... that of course would reverse everything.

 

LoL, that was the problem, i turned it around on the mirror and it works great now, thks for the help guys!

 

haha awesome

 

Glad to have helped. Ive seen it a number of times over the years. It gets knocked off and popped back on backwards. Easy to mistake.. glad its working for you now.