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Diagnosis and Testing|Removal and Installation > < Module Controlled Functions

C-MAX 2003.75 (06.2003-)

Multifunction Electronic Modules - Generic Electronic Module (GEM) C-MAX 2003.75 (06/2003-)
Diagnosis and Testing

Refer to Wiring Diagrams Section 419-10, for schematic and connector information.

Special Tool(s)

Terminal Probe Kit

418-S035
General Equipment
Digital multimeter
Ford approved diagnostic tool

Description of operation

A diagnosis of the generic electronic module (GEM) can be performed with the Ford approved diagnostic tool. Furthermore, an integrated service mode enables testing of the input and output signals without the need for further tools. To enable activation of service mode:

  • Switch off the ignition
  • Switch off all other electrical consumers
  • Apply the handbrake
  • Shift to neutral
  • Close the doors.

Activate service mode

Proceed as follows to activate service mode:

  • PRESS and HOLD the switch of the heated rear window
  • SWITCH ON the ignition.
  • RELEASE the switch of the heated rear window

A signal sounds and the turn signal lamps illuminate to indicate that service mode has been successfully activated.

NOTE:
NOTE:If the alarm is activated (in vehicles fitted with an anti-theft alarm system), service mode cannot be activated.

Input signals

SWITCH the windshield wiper switch to the "Off" position to test the input signals. The following is a list of the switch signals to be tested, in no particular order:

  • Turn signals (right, left, hazard warning lights)
  • Windshield wiper stage I
  • Windshield wiper stage II
  • Windshield washer system
  • Rear window wiper
  • Rear window washer system
  • Doors open/closed
  • Remote control for central locking with double locking
  • Hood up/down (in vehicles fitted with anti-theft alarm system)
  • Tailgate open/closed
  • A/C request signal
  • Heated windshield (if fitted)
  • Parking brake
  • Brake fluid level
  • Cruise control system
  • Autolamps
  • Dipped beam
  • Main beam
  • Headlamp flasher
  • Side lights
  • Reversing lamp
  • Tailgate release
  • Ignition switch, terminal 15 (turn key to 0 position, then turn key to II position.)

An acoustic signal sounds and the turn signal lamps flash to indicate receipt of each input signal by the generic electronic module.

Test the windshield wiper "intermittent mode" stage input signal (only vehicles with adjustable intermittent mode)

The windshield wiper switch must be switched to "intermittent mode" in order to test the input signal. The delay times of the input signals can then be tested by operating the rotary switch. Each change of the rotary switch position is indicated by an acoustic signal and illumination of the turn signals.

Output signals

SWITCH the wiper switch to the "intermittent"" position to test the output signals. PRESSING the heated rear window switch activates the output signals in the following order:

  • Left-hand turn signal
  • Right-hand turn signal
  • Main beam
  • Dipped beam
  • Windshield wiper stage I
  • Windshield wiper stage II
  • Heated rear windshield
  • Heater blower motor
  • Headlamp washer system (vehicles with HID headlamps)
  • Electric booster heater (if fitted)
  • Autolamps (if fitted)
  • Alarm horn (vehicles with alarm system)
  • Rear window wiper
  • Heated rear window relay

When the heated rear window switch is pressed again, the test of the relevant signal is terminated. When the heated rear window switch is pressed once more, the test for the next signal in the list is started.

End service mode

The GEM automatically ends service mode 20 seconds after the last input or at a driving speed of over 7km/h. However, service mode can be manually ended at any time by proceeding as follows:

  • PRESS and HOLD the switch of the heated rear window
  • SWITCH OFF the ignition.
  • RELEASE the switch of the heated rear window

3 signals sound and the turn signal lamps illuminate to indicate that service mode has ended.

Reset service mode

If, after completion of service mode, some functions do not operate or do not operate properly, check the following functions:

  • Instrument cluster illumination, side marker lamps (side lights) and licence plate lamp in automatic headlamps mode
  • Rear wiper
  • Headlamp washer assembly
  • Electric booster heater
  • Alarm horn
  • Heated windshield

If one or more of the listed functions is not OK, it's possible that the cause of the fault is due to not exiting service mode properly. To reactivate the functions correctly, perform the following steps:

  1. Switch off the ignition.
  1. SWITCH OFF the switch for the windscreen wash/wipe system
  1. OPERATE the switch of the heated rear window and HOLD IT THERE
  1. SWITCH ON the ignition.
  1. RELEASE the heated rear window switch (an acoustic signal will sound if activation has been performed correctly)
  1. SWITCH the windscreen wash/wipe switch to the "Intermittent wipe" position
  1. OPERATE the heated rear window switch 6 times (the main beam headlamps switch on and off automatically)
  1. SWITCH OFF the switch for the windscreen wash/wipe system
  1. OPERATE the switch of the heated rear window and HOLD IT THERE
  1. Switch off the ignition.
  1. RELEASE the heated rear window switch (three acoustic signals will sound if activation has been performed correctly)

After completion of the work, check all the functions.

Inspection and Checking

NOTE:
NOTE:The generic electronic module (GEM) is integrated into the central junction box (CJB).
  1. VERIFY customer concern.
  1. Visually CHECK for any obvious mechanical or electrical damage.
NOTE:
NOTE:Ensure correct locking of the wiring harness connector.

Visual Inspection

Electrical
Fuses
Wiring harness
Connectors
  1. RECTIFY any obvious causes for a concern found during the visual inspection before performing any further tests. CHECK the operation of the system.
  1. If the concern persists after the visual inspection, PERFORM a fault diagnosis with the Ford approved diagnostic tool and RECTIFY any displayed faults in accordance with the displayed fault description. CHECK the operation of the system.
  1. For vehicles with no stored fault(s), PROCEED in accordance with the Symptom Chart according to the fault symptom.
  1. Following checking or elimination of the fault and after completion of operations, the fault memories of all vehicle modules must be READ OUT and any stored faults must be DELETED. READ OUT all fault memories again following a road test.

Fault Code Table

DTC Description Action
B1217 Circuit of anti-theft horn relay faulty REFER to: Anti-Theft - Active (419-01A Anti-Theft - Active, Diagnosis and Testing).
B1300 Circuit of central locking switch faulty REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B1311 Circuit of door lock unlock switch faulty REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B1317 Battery voltage too high (greater than 16.5 V) REFER to: Charging System (414-00 Charging System - General Information, Diagnosis and Testing).
B1318 Battery voltage too low (less than 7.5 V) REFER to: Charging System (414-00 Charging System - General Information, Diagnosis and Testing).
B1320 Circuit of driver side door contact switch faulty (open circuit) REFER to: Interior Lighting (417-02 Interior Lighting, Diagnosis and Testing).
B1331 Circuit of tailgate contact switch faulty (open circuit) REFER to: Interior Lighting (417-02 Interior Lighting, Diagnosis and Testing).
B1342 Module error RENEW the central junction box (CJB).
B1345 Circuit of rear window heater switch faulty (short to ground) REFER to: (501-11 Glass, Frames and Mechanisms)
Glass, Frames and Mechanisms - Vehicles With: Front Power Windows (Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Front and Rear Power Windows (Diagnosis and Testing).
B1350 Circuit of heated rear window relay faulty REFER to: (501-11 Glass, Frames and Mechanisms)
Glass, Frames and Mechanisms - Vehicles With: Front Power Windows (Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Front and Rear Power Windows (Diagnosis and Testing).
B1447 Circuit of windshield wiper limit switch (park position) faulty (short to ground) REFER to: Wipers and Washers (501-16 Wipers and Washers, Diagnosis and Testing).
B1502 Circuit of left-hand turn signal lamp faulty (short to ground) REFER to: Turn Signal and Hazard Lamps (417-01, Diagnosis and Testing).
B1506 Circuit of right-hand turn signal lamp faulty (short to ground) REFER to: Turn Signal and Hazard Lamps (417-01, Diagnosis and Testing).
B1510 Circuit of flash-to-pass switch faulty (short to ground) REFER to: Headlamps (417-01, Diagnosis and Testing).
B1520 Circuit of hood contact switch faulty (open circuit) REFER to: Anti-Theft - Active (419-01A Anti-Theft - Active, Diagnosis and Testing).
B1570 Circuit of high beam switch faulty (short to ground) REFER to: Headlamps (417-01, Diagnosis and Testing).
B1577 Circuit of headlight switch (side light) faulty (short to voltage) REFER to: Headlamps (417-01, Diagnosis and Testing).
B1614 Circuit of rear window wiper switch faulty (short to ground) REFER to: Wipers and Washers (501-16 Wipers and Washers, Diagnosis and Testing).
B1792 Circuit of headlight switch (Autolamps) faulty (short to voltage) - vehicles with auto-on system for exterior lighting REFER to: Headlamps (417-01, Diagnosis and Testing).
B1796 Circuit of headlight switch (dipped beam) faulty (short to voltage) REFER to: Headlamps (417-01, Diagnosis and Testing).
B1812 Circuit of reversing light switch faulty (short to voltage) REFER to: Reversing Lamps (417-01, Diagnosis and Testing).
B1838 Circuit of power saving function relay faulty Refer to the Ford approved diagnostic tool.
B1873 Circuit of hazard warning light switch faulty (short to ground) REFER to: Turn Signal and Hazard Lamps (417-01, Diagnosis and Testing).
B1966 Circuit of auxiliary heater faulty (short to voltage) REFER to: Electric Booster Heater (412-02B, Diagnosis and Testing).
B2094 Circuit of heated windshield relay faulty REFER to: (501-11 Glass, Frames and Mechanisms)
Glass, Frames and Mechanisms - Vehicles With: Front Power Windows (Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Front and Rear Power Windows (Diagnosis and Testing).
B2113 Circuit of windshield heater switch faulty (short to ground) REFER to: (501-11 Glass, Frames and Mechanisms)
Glass, Frames and Mechanisms - Vehicles With: Front Power Windows (Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Front and Rear Power Windows (Diagnosis and Testing).
B2114 Circuit of windshield washer system switch faulty (short to ground) REFER to: Wipers and Washers (501-16 Wipers and Washers, Diagnosis and Testing).
B2115 Circuit of rear window washer system switch faulty (short to ground) REFER to: Wipers and Washers (501-16 Wipers and Washers, Diagnosis and Testing).
B2175 Circuit of A/C system ON/OFF switch faulty (short to ground) REFER to: Climate Control System (412-00, Diagnosis and Testing).
B2177 Circuit of interior monitoring sensor faulty REFER to: Anti-Theft - Active (419-01A Anti-Theft - Active, Diagnosis and Testing).
B2179 Circuit of front windshield wash/wipe system switch (Intermittent switch position) faulty (short to ground) REFER to: Wipers and Washers (501-16 Wipers and Washers, Diagnosis and Testing).
B2180 Circuit of windshield wiper switch (switch position 2) faulty (short to ground) REFER to: Wipers and Washers (501-16 Wipers and Washers, Diagnosis and Testing).
B2181 Circuit of windshield wiper switch (switch position 3) faulty (short to ground) REFER to: Wipers and Washers (501-16 Wipers and Washers, Diagnosis and Testing).
B2258 Circuit of headlamp wash/wipe system relay faulty REFER to: Wipers and Washers (501-16 Wipers and Washers, Diagnosis and Testing).
B2477 Faulty module configuration CONFIGURE the GEM again using the Ford approved diagnostic tool. If the fault occurs again, RENEW the CJB.
B2478 Circuit of anti-theft alarm system deactivation switch faulty (short to ground) REFER to: Anti-Theft - Active (419-01A Anti-Theft - Active, Diagnosis and Testing).
B2515 Circuit of blower motor relay faulty REFER to: Climate Control System (412-00, Diagnosis and Testing).
B2665 Circuit of alarm horn with battery faulty (short to voltage) REFER to: Anti-Theft - Active (419-01A Anti-Theft - Active, Diagnosis and Testing).
B2667 Circuit of tailgate unlock switch faulty (short to ground) REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B2671 Circuit of tailgate unlock motor faulty REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B2898 Circuit of right-hand turn signal lamp faulty REFER to: Instrument Cluster (413-01, Diagnosis and Testing).
B2899 Circuit of left-hand turn signal lamp faulty REFER to: Instrument Cluster (413-01, Diagnosis and Testing).
B2902 Circuit of tailgate contact switch faulty REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B2947 Circuit of global closing function faulty (short to ground / open circuit) REFER to: Glass, Frames and Mechanisms - Vehicles With: Front and Rear Power Windows (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
B2949 Circuit of global closing function faulty (short to voltage) REFER to: Glass, Frames and Mechanisms - Vehicles With: Front and Rear Power Windows (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing).
C1327 Circuit of brake fluid reservoir switch faulty (open circuit) REFER to: Brake System (206-00, Diagnosis and Testing).
C1751 Circuit of vehicle speed sensor faulty (short to voltage) - vehicles with sliding roof and without ABS REFER to: Electronic Engine Controls (303-14, Diagnosis and Testing).
C1752 Circuit of vehicle speed sensor faulty (short to ground / open circuit) - vehicles with sliding roof and without ABS REFER to: Electronic Engine Controls (303-14, Diagnosis and Testing).
P0071 Circuit of ambient temperature sensor faulty Refer to the Ford approved diagnostic tool.
P0565 Circuit of cruise control switch faulty (ON switch) REFER to: Speed Control (310-03, Diagnosis and Testing).
P0566 Circuit of cruise control switch faulty (OFF switch) REFER to: Speed Control (310-03, Diagnosis and Testing).
P0567 Circuit of cruise control switch faulty (Resume switch) REFER to: Speed Control (310-03, Diagnosis and Testing).
P0568 Circuit of cruise control switch faulty (Acceleration switch) REFER to: Speed Control (310-03, Diagnosis and Testing).
P0569 Circuit of speed control switch faulty (Deceleration switch) REFER to: Speed Control (310-03, Diagnosis and Testing).
P0579 Circuit of speed control switch faulty REFER to: Speed Control (310-03, Diagnosis and Testing).
P0581 Circuit of speed control switch faulty REFER to: Speed Control (310-03, Diagnosis and Testing).

Symptom Chart

Symptom Possible Sources Action
Generic electronic module (GEM) not communicating with the diagnostic unit
*
Fuse(s).
*
Circuit(s).
*
Generic electronic module (GEM).
*
REFER to: Communications Network (418-00, Diagnosis and Testing).
Various functions of the generic electronic module are not working
*
The self-test was not ended correctly.
*
See Reset service mode.

Diagnosis and Testing|Removal and Installation > < Module Controlled Functions