PINPOINT TEST A: THE COMPASS IS INOPERATIVE (Continued)
A7 CHECK THE COMPASS SIGNAL RETURN CIRCUIT FOR AN OPEN OR SHORT TO GROUND (Continued)
• Is the resistance less than 5 ohms between the auto-dimming
interior mirror and the IPC, and greater than 10,000 ohms
between the auto-dimming interior mirror and ground?
A8
CHECK FOR DTC U0161:87 OR DTC U0161:92
• Connect: IPC C220.
• Connect: Auto-Dimming Interior Mirror C911, C9012 or C9039.
• Ignition ON.
• Clear the IPC DTCs.
• Ignition OFF.
• Ignition ON.
• Wait 10 seconds.
• Retrieve the IPC DTCs.
• Is DTC U0161:87 or DTC U0161:92 present?
Yes
INSTALL a new auto-dimming interior mirror. REFER
to Section 501-09. ADJUST the zone setting. REFER
to Compass Zone Adjustment in this section.
CALIBRATE the compass. REFER to Compass
Calibration in this section. TEST the system for normal
operation.
No
GO to A9.
A9 CHECK FOR CORRECT IPC OPERATION
• Disconnect the IPC connector.
• Check for:
— corrosion
— damaged pins
— pushed-out pins
• Connect the IPC connector and make sure it seats correctly.
• Operate the system and verify the concern is still present.
• Is the concern still present?
Yes
INSTALL a new IPC. REFER to Section 413-01.
CLEAR the DTCs. REPEAT the self-test. TEST the
system for normal operation.
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.
Pinpoint Test B: The Compass Is Inaccurate
NOTE:
This procedure is only applicable to vehicles without navigation. If the compass display is inaccurate on a vehicle with navigation, install a new Front
Display Interface Module (FDIM). Refer to Section 415-00.
Normal Operation
When calibrated correctly, the compass module (integral to the auto-dimming interior mirror) provides vehicle directional inputs to the Instrument Panel
Cluster (IPC) which sends the compass information to the FDIM over the Medium Speed Controller Area Network (MS-CAN). The FDIM displays the
vehicle heading based on the selected zone setting.
419-11-9 Electronic Compass 419-11-9
DIAGNOSIS AND TESTING (Continued)
2011 Mustang, 2/2011
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