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 Front Display Interface Module (FDIM) over the Medium Speed Controller Area Network (MS-CAN). The FDIM displays the
compass direction according to the information that has been provided by the compass module to the IPC.
•
DTC U0161:87 (Lost Communication With Compass Module: Missing Message) — sets when the IPC does not receive any communications from the
compass module.
•
DTC U0161:92 (Lost Communication With Compass Module: Performance or Incorrect Operation) — sets when the IPC attempts a self-test of the
compass module and its associated circuits and a failure results.
This pinpoint test is intended to diagnose the following:
•
Fuse(s)
•
Wiring, terminals or connectors
•
Compass module (integral to the auto-dimming interior mirror)
•
FDIM
•
IPC
PINPOINT TEST A: THE COMPASS IS INOPERATIVE
NOTICE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE:
Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Section 414-01.
Test Step Result / Action to Take
A1 CHECK THE COMPASS DISPLAY
• Ignition ON.
• Check the compass display in the lower LH corner of the FDIM.
• Does the compass display illuminate?
Yes
If the compass display illuminates with only 2 bars, GO
to A2.
If the compass display turns on, but it does not display
all directions, or indicates CAL, GO to Pinpoint Test B.
No
REFER to Section 415-00.
A2 CHECK THE COMPASS MODULE VOLTAGE SUPPLY
• Ignition OFF.
• Disconnect: Auto-Dimming Interior Mirror C911 (Without Camera
Mirror, Without SYNC).
• Disconnect: Auto-Dimming Interior Mirror C9012 (Without Camera
Mirror, With SYNC).
• Disconnect: Auto-Dimming Interior Mirror C9039 (With Camera
Mirror).
• Ignition ON.
• 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
C911-1
CBP41 (BU)
Ground
Without camera
mirror, with SYNC
C9012-1
CBP41 (BU)
Ground
With camera mirror C9039-1
CBP41 (BU)
Ground
Yes
GO to A3.
No
VERIFY the Smart Junction Box (SJB) fuse 41 (15A) is
OK. If OK, REPAIR the circuit. TEST the system for
normal operation. If not OK, REFER to the Wiring
Diagrams Manual to identify the possible causes of the
circuit short.
419-11-4
Electronic Compass 419-11-4
DIAGNOSIS AND TESTING (Continued)
2011 Mustang, 2/2011
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