E 450 V8-5.4L (2009)
A9 CHECK CIRCUIT GD126 (BK/WH) FOR AN OPEN
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Disconnect: Negative Battery Cable.
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Measure the resistance between the overhead console C930-2, circuit GD126 (BK/WH), harness side and ground.
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Is the resistance less than 5 ohms?
Yes
INSTALL a new compass display (overhead console). REFER to Compass Display See: Service and Repair. CONNECT the negative battery cable.
TEST the system for normal operation.
No
REPAIR the circuit. CONNECT the negative battery cable. TEST the system for normal operation.
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Pinpoint Test B: The Outside Air Temperature Is Inaccurate/Inoperative
Electronic Compass
Pinpoint Tests
Pinpoint Test B: The Outside Air Temperature Is Inaccurate/Inoperative
Refer to Wiring Diagram Set 102, Overhead Console for schematic and connector information. See: Diagrams/Electrical Diagrams/Diagrams By
Number
Normal Operation
The compass and ambient air temperature display can be turned on and off by pressing the SELECT switch in the overhead console.
The temperature can be displayed in Celsius or Fahrenheit by pressing the SELECT switch.
The ambient air temperature display receives temperature input from the ambient air temperature sensor through circuits VH407 (YE/GN) and RH107
(GN/BU). If the circuits are shorted or open, then the display shows 60°C (140°F) (shorted), or -40°C (-40°F) (open).
The ambient air temperature display receives voltage from the Smart Junction Box (SJB) fuse 43 (10A) through circuit CBP43 (GY). Ground for the
ambient air temperature display is provided by circuit GD126 (BK/WH).
This pinpoint test is intended to diagnose the following:
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Wiring, terminals or connectors
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Ambient air temperature sensor
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Compass and ambient air temperature display
PINPOINT TEST B: THE OUTSIDE AIR TEMPERATURE IS INACCURATE/INOPERATIVE
NOTE: After installing a new compass display, always set the zone and calibrate.
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B1 CHECK FOR A CORRECTLY INSTALLED AMBIENT AIR TEMPERATURE SENSOR
