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Owners Guide (Manual) for 96 Bronco Source: by hillerford.com
See page 142 and on for operation. Same for your 95, as is following"
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The compass system consists of an electronic compass transducer and the overhead console to display the direction.
The digital compass will be displayed when the MODE button is pressed. The current vehicle heading will be displayed as one of the following directions: N, NE, E, SE, S, SW, W and NW.
Wiring Diagram & Compass/Outside Temperature Display Module Connector Pin-Outs from a 96 Eddie Bauer in an 83
Source: by Seabronc (Rosie, Fred W) at SuperMotors.net Fred wrote in caption; "...Note that one of the sensors wires is grounded. However that is not the case for all years of Ford vehicles that use the sensor. In most cases it is brought back to the OHC computer..."
Inspection and Verification
The diagnostic procedures are intended to isolate a nonfunctional compass and thermometer (19A548) from a fault in the vehicle wiring harness. The connector housing is as shown in the preceding illustration.
Before replacing a compass and thermometer due to incorrect compass readings, first perform the Zone Adjustment procedure in the Adjustments portion of this section. If the compass transducer is still inaccurate, perform Calibration Adjustment, then set the zone adjustment again. If this fails to correct inaccuracy, the vehicle must be demagnetized
Symptom Chart — Compass/Outside Temperature Display
Use Rotunda Digital Volt-Ohmmeter 014-00407
or equivalent to perform electrical pinpoint tests. COMPASS/OUTSIDE TEMPERATURE DISPLAY
Compass Reading Is Inaccurate:
Calibration zone adjustment.
Vehicle magnetized.
Power supply or wiring.
Damaged unit.
GO to Pinpoint Test A.
...........
Temperature Display Inaccurate:
Wiring.
Damaged unit.
GO to Pinpoint Test B.
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Compass/Outside Temperature Display Pinpoint Tests in a 96 from 1996 Eddie Bauer Bronco Workshop Manual
PINPOINT TEST A: COMPASS READING IS INACCURATE
A1 DISPLAY PROVEOUT
Key to RUN.
Verify that following display actions occurred in order:
All segments light for approximately one second.
All segments go blank for approximately one second.
Compass then displays directional heading.
Is display functioning correctly?
Yes Go to A3
No If compass display does not light, GO to A2.
If some segments do not light, REPLACE compass and thermometer.
If some segments do not turn off, REPLACE compass and thermometer.
If directional heading is not displayed, DEMAGNETIZE vehicle. (see below)
If directional heading is displayed, GO to A2.
If CAL is shown on display, slowly DRIVE in circles until CAL is NOT lit. If, after three circles, CAL is still lit, DEMAGNETIZE and DRIVE in circles again. After three circles DEMAGNETIZE and DRIVE in circles again
A2 DIMMING CIRCUIT CHECK
Pull and rotate headlamp dimmer switch.
Does compass display dim correspondingly with instrument panel illumination lamps?
Yes GO to A3.
No GO to A5. If compass display goes blank, REPLACE compass and thermometer. RETEST system
A3 COMPASS ACCURACY CHECK
Perform compass Calibration Procedure and Zone Adjustment.
Observe and record compass switch points while driving vehicle in a circle.
Verify that each compass heading quadrant is greater than 35 degrees and less than 55 degrees wide
Is compass accurate?
Yes GO to A4.
No PERFORM Vehicle Demagnetizing procedure. REPEAT Calibration Procedure and Zone Adjustment. If compass still is not accurate, REPLACE compass. RETEST system
A4 POWER SUPPLY CHECK
Remove one ***** retaining overhead console to roof.
Disconnect the 10-pin connector.
Key to RUN.
Using Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, verify battery voltage on Pin 8, Circuit 296 (W/P).
Is battery voltage present?
Yes REPLACE compass and thermometer. RETEST system.
No SERVICE wiring or ignition switch. RETEST system.
A5 VOLTAGE CHECK
Remove one ***** retaining overhead console to roof.
Disconnect the 10-pin connector.
Key to RUN.
Using Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, verify that voltage is present on Pin 3, Circuit 19 (LB/R) and that it varies as the dimmer rheostat is rotated.
Does voltage vary?
Yes REPLACE compass and thermometer. RETEST system.
No SERVICE wiring back to dimmer rheostat. RETEST system
PINPOINT TEST B: TEMPERATURE DISPLAY INACCURATE
B1 SENSOR CIRCUIT TEST
Disconnect overhead console 10-pin connector and temperature sensor 2-pin connector.
Using Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, verify continuity between 10-pin connector Pin 2, Circuit 233 (DB/Y) and 2-pin connector Circuit 233 (DB/Y).
Is continuity present?
Yes GO to B2.
No SERVICE Circuit 233 (DB/Y) for open. RETEST system.
B2 CONTINUITY CHECK
Using Rotunda Digital Volt-Ohmmeter 014-00407 or equivalent, verify continuity between 2-pin connector Circuit 767 (LB/O) at ambient sensor and compass/outside temperature module connector Pin 1.
Is continuity present?
Yes REPLACE thermometer sensor. RETEST system.
No SERVICE Circuit 767 (LB/O) for open. RETEST system.
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Vehicle Demagnetizing
If the compass is inaccurate after calibration, vehicle magnetism may be too high and vehicle demagnetizing is necessary. Initially the vehicle is demagnetized at the manufacturer's plant. In most cases this is sufficient for the life of the vehicle. However, if after calibration the compass still is inaccurate, demagnetizing must be performed.
NOTE: The demagnetizing procedure must be followed exactly. Failure to do so may result in the vehicle being remagnetized.
NOTE: Whenever the demagnetizing equipment is being operated over the vehicle's surface, or within 1m (3 ft.) of the vehicle, the operator must maintain a constant, steady motion. Failure to do so may result in the vehicle being remagnetized.
The demagnetizing process requires the use of a demagnetizing coil commonly used by TV service technicians to demagnetize television tubes. Demagnetize the vehicle by sweeping over the compass sensor with a demagnetizing coil as follows:
Standing 1m (3 ft.) or more away from the vehicle, turn on the demagnetizing coil.
In one continuous motion make four passes over the compass sensor. The demagnetizer should be held 2-1/2 cm (1 inch) or less (but not touching) from the vehicle's roof.
After the fourth pass, and without stopping the motion of the demagnetizing coil, pull away from the vehicle.
When the demagnetizer coil is at least 1m (3 ft.) away from the vehicle, turn the demagnetizing coil off.
Perform the Zone Adjustment and Calibration Adjustment procedures as described in the Adjustments portion of this section.
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Calibration Adjustment
The compass is designed to recalibrate itself if changes in vehicle magnetics occur.
Occasionally, the vehicle magnetics will change enough to prevent the compass from correcting itself. If the preceding zone adjustment does not correct an inaccurate compass, the compass should be calibrated. If a compass transducer unit is newly installed in a vehicle, the calibration procedure must be performed. To calibrate the compass, perform the following procedure:
Find an open area free from steel structures and high voltage lines.
Press and hold MODE button until the CAL indicator appears in the display.
Release the MODE button.
Drive the vehicle less than 8 km/h (5 mph) in 360° circles until CAL indicator turns off. This will occur within 2 to 3 complete circles.
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Zone Adjustment
The vehicle has been demagnetized and the compass calibrated by the manufacturer. However, the zone adjustment is not done by the manufacturer.
When the vehicle is received from the manufacturer or whenever a vehicle operator claims that the compass is inaccurate, first perform the zone adjustment. The compass zone adjustment is as follows:
Determine which zone of the continent you are in by using the accompanying zone map.
Press and hold the MODE button until VAR appears on display. The overhead console will display the current zone number.
Press the MODE button until the appropriate zone number appears on the display. (The zone number will increment once each time the MODE button is pressed. Once the number reaches 15, the next press will change the zone to 1.)
Release the MODE button and after a few seconds the display will return to the normal compass heading mode. The zone adjustment is now complete.
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Factors Affecting Accuracy
Various internal and external conditions can affect compass accuracy.
Magnetic mount devices (antennas, racks, etc.) should not be located near the magnetic sensor. Use of these devices near the sensor will cause the compass to be inaccurate. If these devices must be used, the compass should be recalibrated using the zone and calibration adjustments.
Driving near power lines or objects with high iron or steel content (bridges, underground pipes and tunnels, etc.) may temporarily change the compass heading. The display will return to the true vehicle heading after the vehicle leaves the area.
In most locations, magnetic north differs from the "true north" direction shown on maps (geographic north). This difference changes considerably across the country anywhere from 25 degrees to the east to 30 degrees to the west. This misalignment can be corrected on the compass by performing the Zone Adjustment procedure described in the Adjustments portion of this section.
The temperature display operates through the use of a thermometer sensor (15A022) mounted behind the front bumper/grille. The display can be changed from English to metric units.
To update the temperature, the module processes data from the sensor to make sure engine heat does not affect the displayed temperature. Upon starting the vehicle, the module checks the temperature and how long the ignition switch has been off. These parameters are described by one of three groups below.
Engine Cold
If ignition has been on for less than five minutes, and was previously off for longer than two hours, the engine is cold and does not affect the temperature sensor. Current sensor data is used.
Engine Warm, Updated Temperature Cooler
If ignition has been on for longer than five minutes or if the ignition was off for less than two hours, the engine compartment may be warm from the heat of the engine. The current temperature is displayed only if it is less than the stored temperature reading.
Engine Warm, Updated Temperature Warmer
If the sensor data indicates a higher temperature, the module uses a high-speed counter to monitor vehicle speed to determine whether engine heat is causing erroneous readings. The counter is incremented when the speed is greater than 53 km/h (33 mph) and decremented when the speed is between 16 and 53 km/h (10-33 mph). If the speed is less than 16 km/h (10 mph), the counter is reset, and the displayed temperature is not updated from its last reading. If the counter is greater than two minutes, the currently sensed temperature is displayed. If the high-speed counter has counted less than two minutes, the temperature can increase only one degree per minute.
If the temperature sensor is short- or open-circuited, the display will read SC or OC, respectively. If the temperature drops below 3°C (38°F), or is below 3°C (38°F) upon power-up, the display will alternate between displaying ICE and the temperature. The display will alternate every two seconds for a time of one minute.
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TSB 96-08-15 Erratic Compass & Map Lamp Operation - Vehicles Built Through 2/1/96
Publication Date: APRIL 8, 1996
LIGHT TRUCK:
1993-96 EXPLORER
1994-96 BRONCO
ISSUE: Map lamp switch and/or overhead
compass function operation is irregular, and/or map lamp bulbs may burn out on some vehicles. Installation of revised parts should resolve this issue.
ACTION: Replace the map lamp, switch, compass and wiring harness with a revised Overhead Console Kit (F67Z-78519C42-AA). Refer to Instruction Sheet #7151, included with the kit, for service procedure.
The Overhead Console Kit (F67Z-78519C42-AA) includes the following:
One (1) Map Lamp Assembly
One (1) Map Lamp Button
One (1) Compass
One (1) Wiring Harness
One (1) Modification Label
One (1) Instruction Sheet (I.S. #7151)
PART NUMBER PART NAME
F67Z-78519C42-AA Overhead Console Kit
OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage
OPERATION DESCRIPTION TIME
960815A Replace Map Lamp And Console Assembly 0.3 Hr
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REMOVAL AND INSTALLATION
Compass/Outside Temperature Display Removal
Remove ***** at the front of the overhead console.
Gently pull console downward to release the three trim spring clips.
Disconnect the electrical connector.
Lay console upside down on a surface which will not mar the appearance.
Disconnect the 10-pin electrical connector from the compass and thermometer (19A548). Also unlatch the larger connector from the top of the console housing.
NOTE: The garage opener door will be attached to the bezel as it is removed; thus the door latch must also be disengaged to allow removal.
NOTE: The entire compass/lamp bezel must first be removed from the console housing.
Remove the seven screws which attach the bezel to the console housing. Gently push on the top side of the interior lamp (13776) to disengage the bezel from the housing.
The bottom side of the compass is latched to the bezel with a plastic hook. Remove the compass from the bezel by gently pulling upward and forward.
Installation
Assemble the compass to the bezel by first hooking it to the front side of the bezel, then rotating it into position with the ***** attachment points lying over the lamp ***** boss.
Drive two screws to hold the compass and interior lamp to the bezel.
Assemble the bezel to the console housing by sliding the front edge into the housing; then gently push the rear of the bezel and the door into position.
Drive five screws to retain the bezel to the console housing.
Reattach the electrical connectors.
To install the console to the vehicle, connect the electrical connector to the vehicle connector.
Position the console on the headliner by pressing firmly upward near the compass and interior lamp buttons to engage the attaching clips.
Drive one ***** through the console housing at the front of the overhead console.
