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419-11-i
Electronic Compass 419-11-i
SECTION 419-11 Electronic Compass
CONTENTS PAGE
DIAGNOSIS AND TESTING
Electronic Compass ............................................................................................................................................................ 419-11-2
Principles of Operation ................................................................................................................................................. 419-11-2
Inspection and Verification ........................................................................................................................................... 419-11-2
DTC Charts ................................................................................................................................................................... 419-11-3
Symptom Chart ............................................................................................................................................................. 419-11-3
Pinpoint Tests ............................................................................................................................................................... 419-11-3
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419-11-2
DIAGNOSIS AND TESTING
Electronic Compass
Special Tool(s)
Electronic Compass 419-11-2
Fluke 77-IV Digital Multimeter
FLU77-4 or equivalent
Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software
with appropriate hardware, or equivalent scan tool
Flex Probe Kit
105-R025D or equivalent
Principles of Operation
NOTE:
The Smart Junction Box (SJB) is also known as the Generic Electronic Module (GEM).
NOTE:
This procedure is only applicable to vehicles without navigation. For vehicles with navigation, refer to Section 415-00.
The compass display (located in the Front Display Interface Module (FDIM)) receives battery voltage from the SJB. The compass module (integral to the
auto-dimming interior mirror) provides hardwired 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 compass is capable of self-calibrating. This decreases the need to manually set
the compass. If the compass is displaying a heading (and not displaying the C or CAL indicator), the compass is in auto-calibration mode. In this mode, the
compass automatically calibrates for changes in vehicle magnetics over the life of the vehicle. This auto-calibration mode makes sure the compass heading is
always accurate. If the compass displays the C or CAL indicator for an extended period of time (longer than 5 seconds), this indicates the compass has been
placed in the manual calibration mode and therefore, requires manual calibration.
Inspection and Verification
1. Verify the customer concern.
2. Visually inspect for obvious signs of mechanical or electrical damage.
Visual Inspection Chart
Mechanical Electrical
• Compass module (integral to the auto-dimming interior mirror)
• Front Display Interface Module (FDIM)
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. NOTE:
Make sure to use the latest scan tool software release.
• Smart Junction Box (SJB) fuse(s):
— 14 (10A) (FDIM)
— 41 (15A) (compass module)
• Wiring, terminals or connectors
If the cause is not visually evident, connect the scan tool to the Data Link Connector (DLC).
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419-11-3
Electronic Compass 419-11-3
DIAGNOSIS AND TESTING (Continued)
5. NOTE:
The Vehicle Communication Module (VCM) LED prove-out confirms power and ground from the DLC are provided to the VCM.
If the scan tool does not communicate with the VCM:
• Check the VCM connection to the vehicle.
• Check the scan tool connection to the VCM.
• Refer to Section 418-00, No Power To The Scan Tool, to diagnose no power to the scan tool.
6. If the scan tool does not communicate with the vehicle:
• Verify the ignition key is in the ON position.
• Verify the scan tool operation with a known good vehicle.
• Refer to Section 418-00 to diagnose no response from the PCM.
7. Carry out the network test.
If the scan tool responds with no communication for one or more modules, refer to Section 418-00.
•
If the network test passes, retrieve and record the continuous memory DTCs.
•
8. Clear the continuous DTCs and carry out the self-test diagnostics for the FDIM and the Instrument Panel Cluster (IPC).
9. If the DTCs retrieved are related to the concern, go to DTC Charts. For all other DTCs, refer to the Diagnostic Trouble Code (DTC) Chart in Section
419-10.
10. If no DTCs related to the concern are retrieved, GO to Symptom Chart.
DTC Charts
NOTE:
This module utilizes a 5-character DTC followed by a 2-character failure-type code. The failure-type code provides information about specific fault
conditions such as opens, or shorts to ground. Continuous memory DTCs have an additional 2-character DTC status code suffix to assist in determining DTC
history.
Instrument Panel Cluster (IPC) DTC Chart
DTC Description Action
U0161:87 Lost Communication With Compass Module: Missing Message GO to Pinpoint Test A.
U0161:92 Lost Communication With Compass Module: Performance or
Incorrect Operation
All other DTCs — REFER to the Diagnostic Trouble Code (DTC) Chart in Section
GO to Pinpoint Test A.
419-10.
Symptom Chart
Symptom Chart
Condition Possible Sources Action
The compass is inoperative
•
The compass is inaccurate
•
Fuse(s)
•
Wiring, terminals or connectors
•
Compass module (integral to the auto-
•
dimming interior mirror)
Front Display Interface Module (FDIM)
•
Instrument Panel Cluster (IPC)
•
Compass zone setting
•
Compass calibration
•
Compass module (integral to the auto-
•
dimming interior mirror)
GO to Pinpoint Test A.
•
GO to Pinpoint Test B.
•
Pinpoint Tests
Pinpoint Test A: The Compass Is Inoperative
Refer to Wiring Diagrams Cell 124 Power Mirrors for schematic and connector information.
Normal Operation
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Electronic Compass 419-11-4
DIAGNOSIS AND TESTING (Continued)
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?
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:
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.
Option Content Positive Meter Lead Negative Meter
Without camera
mirror, without SYNC
Without camera
mirror, with SYNC
With camera mirror C9039-1
C911-1
CBP41 (BU)
C9012-1
CBP41 (BU)
CBP41 (BU)
Lead
Ground
Ground
Ground
2011 Mustang, 2/2011
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.
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419-11-5
Electronic Compass 419-11-5
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: THE COMPASS IS INOPERATIVE (Continued)
A2 CHECK THE COMPASS MODULE VOLTAGE SUPPLY (Continued)
• Is the voltage greater than 10 volts?
A3
CHECK THE COMPASS MODULE GROUND FOR CONTINUITY
• Ignition OFF.
• Disconnect: Negative Battery Cable.
• Measure the resistance between the auto-dimming interior mirror,
harness side and ground as follows:
Option Content Positive Meter Lead Negative Meter
Without camera
mirror, without SYNC
Without camera
mirror, with SYNC
With camera mirror C9039-3
C911-3
GD139 (BK/YE)
C9012-10
GD139 (BK/YE)
GD139 (BK/YE)
Lead
Ground
Ground
Ground
Yes
GO to A4.
No
REPAIR the circuit. TEST the system for normal
operation.
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Electronic Compass 419-11-6
DIAGNOSIS AND TESTING (Continued)
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?
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
Without camera
mirror, without SYNC
Without camera
mirror, with SYNC
With camera mirror C9039-10
C911-7
VMC30 (BU/GY)
C911-6
VMC31 (GY/BU)
C9012-2
VMC30 (BU/GY)
C9012-6
VMC31 (GY/BU)
VMC30 (BU/GY)
Lead
Ground
Ground
Ground
Ground
Ground
Yes
REFER to Section 415-00.
No
GO to A5.
Yes
REPAIR the circuit in question. TEST the system for
normal operation.
No
GO to A6.
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Electronic Compass 419-11-7
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: THE COMPASS IS INOPERATIVE (Continued)
A5 CHECK THE COMPASS SIGNAL CIRCUITS FOR A SHORT TO VOLTAGE (Continued)
(Continued)
Option Content Positive Meter Lead Negative Meter
C9039-9
VMC31 (GY/BU)
Lead
Ground
• Is any voltage present?
A6
CHECK THE COMPASS SIGNAL CIRCUIT FOR AN OPEN OR SHORT TO GROUND
• Ignition OFF.
• Measure the resistance between the auto-dimming interior mirror,
harness side and the IPC, harness side; and between the autodimming interior mirror, harness side and ground as follows:
Option Content Positive Meter Lead Negative Meter
Without camera
mirror, without SYNC
Without camera
mirror, with SYNC
With camera mirror C9039-9
C911-6
VMC31 (GY/BU)
C9012-6
VMC31 (GY/BU)
VMC31 (GY/BU)
Lead
C220-10
VMC31 (GY/BU),
then ground
C220-10
VMC31 (GY/BU),
then ground
C220-10
VMC31 (GY/BU),
then ground
Yes
GO to A7.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the
self-test.
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Electronic Compass 419-11-8
DIAGNOSIS AND TESTING (Continued)
PINPOINT TEST A: THE COMPASS IS INOPERATIVE (Continued)
A6 CHECK THE COMPASS SIGNAL 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?
A7
CHECK THE COMPASS SIGNAL RETURN CIRCUIT FOR AN OPEN OR SHORT TO GROUND
• Measure the resistance between the auto-dimming interior mirror,
harness side and the IPC, harness side; and between the autodimming interior mirror, harness side and ground as follows:
Option Content Positive Meter Lead Negative Meter
Without camera
mirror, without SYNC
Without camera
mirror, with SYNC
With camera mirror C9039-10
C911-7
VMC30 (BU/GY)
C9012-2
VMC30 (BU/GY)
VMC30 (BU/GY)
Lead
C220-9
VMC30 (BU/GY),
then ground
C220-9
VMC30 (BU/GY),
then ground
C220-9
VMC30 (BU/GY),
then ground
Yes
GO to A8.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the
self-test.
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419-11-9 Electronic Compass 419-11-9
DIAGNOSIS AND TESTING (Continued)
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?
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?
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.
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.
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.
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.
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Electronic Compass 419-11-10
DIAGNOSIS AND TESTING (Continued)
This pinpoint test is intended to diagnose the following:
Compass zone setting
•
Compass calibration
•
Compass module (integral to the auto-dimming interior mirror)
•
PINPOINT TEST B: THE COMPASS IS INACCURATE
NOTICE:
Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
Test Step Result / Action to Take
B1 CHECK THE COMPASS ACCURACY
• Set the zone. Refer to Compass Zone Adjustment in this section.
• Calibrate the compass. Refer to Compass Calibration in this section.
• Observe the compass display with the vehicle pointing in several
different directions, as follows:
Direction Compass Display
North N
Northeast NE
East E
Southeast SE
South S
Southwest SW
West W
Northwest NW
• Does the compass display correctly for each direction?
Yes
The compass is OK. The concern may have been
caused by an incorrect zone setting, or the compass
was out of calibration.
No
INSTALL a new compass module. REFER to AutoDimming Interior Mirror in Section 501-09. SET the
zone. REFER to Compass Zone Adjustment in this
section. CALIBRATE the compass. REFER to
Compass Calibration in this section. TEST the system
for normal operation.
2011 Mustang, 2/2011
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