Ford ST2834-A - CHECK THE DTCS; CHECK THE COMPASS SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE

PINPOINT TEST A: THE COMPASS IS INOPERATIVE (Continued)
A3 CHECK THE COMPASS MODULE GROUND FOR CONTINUITY (Continued)
• Is the resistance less than 5 ohms?
A4
CHECK THE DTCs
• Connect: Negative Battery Cable.
• Connect: Auto-Dimming Interior Mirror C911, C9012 or C9039.
• Ignition ON.
• Clear the FDIM DTCs.
• Ignition OFF.
• Ignition ON.
• Wait 10 seconds.
• Retrieve the FDIM DTCs.
• Is DTC U0155:00 present?
Yes
REFER to Section 415-00.
No
GO to A5.
A5 CHECK THE COMPASS SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE
• Ignition OFF.
• Disconnect: Auto-Dimming Interior Mirror C911, C9012 or C9039.
• Disconnect: IPC C220.
• Measure the voltage between the auto-dimming interior mirror,
harness side and ground as follows:
Option Content Positive Meter Lead Negative Meter
Lead
Without camera
mirror, without SYNC
C911-7
VMC30 (BU/GY)
Ground
C911-6
VMC31 (GY/BU)
Ground
Without camera
mirror, with SYNC
C9012-2
VMC30 (BU/GY)
Ground
C9012-6
VMC31 (GY/BU)
Ground
With camera mirror C9039-10
VMC30 (BU/GY)
Ground
Yes
REPAIR the circuit in question. TEST the system for
normal operation.
No
GO to A6.
419-11-6
Electronic Compass 419-11-6
DIAGNOSIS AND TESTING (Continued)
2011 Mustang, 2/2011