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5 Body and Paint > < Generic Electronic Module (GEM)

Ka 1997 (09.1996-)

Multifunction Electronic Modules - Generic Electronic Module (GEM) Ka 1997 (09/1996-)
Diagnosis and Testing

Special Tool(s)

Terminal Probe Kit

29-011A
General Equipment
Digital multimeter
Worldwide Diagnostic System (WDS)

Description of operation

A diagnosis of the generic electronic module (GEM) can be performed with WDS. Furthermore, an integrated service mode enables testing of the input and output signals without the need for further tools. Before activating service mode:

  • switch off the ignition,
  • switch off all other electrical consumers,
  • apply the handbrake and
  • shift to neutral.

Activating the service mode

Proceed as follows to activate the service mode:

  • SWITCH OFF the ignition
  • Within 8 seconds, OPERATE the driver's side door contact switch 6 times

Successful activation is shown by a single flash of the turn signal lamps.

NOTE:
NOTE:If the alarm has been triggered (in vehicles equipped with an anti-theft alarm system), service mode cannot be activated.

Input signals

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

  • windshield washer system
  • Doors open/closed
  • Hood open/closed (in vehicles equipped with an anti-theft alarm system)
  • Ignition "ON"
  • Luggage compartment cover unlocking switch
  • Switch - convertible top compartment lid (StreetKa only)

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

Ending the service mode

The GEM automatically ends service mode 20 seconds after the last input.

Exit from service mode is shown by a double flash of the turn signal lamps.

Inspection and Checking

  1. VERIFY the customer concern.
  1. Visually CHECK for any obvious mechanical or electrical damage.

Visual Inspection

Electrical
  • Fuses
  • Wiring harness
  • Connector(s)
  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 WDS and RECTIFY any displayed faults in accordance with the displayed fault description. CHECK the operation of the system.
  1. For vehicles with no stored faults, 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.

Diagnostic Trouble Code Table

Diagnostic Trouble Code Description Action
B1298 Voltage supply (terminal 15) faulty (short to voltage) GO to Pinpoint Test A.
B1299 Voltage supply (terminal 15) faulty (short to ground) GO to Pinpoint Test A.
B1315 Circuit of battery protection relay faulty (short to voltage) CHECK the GEM and RENEW as necessary.
B1316 Circuit of battery protection relay faulty (short to ground) CHECK the GEM and RENEW as necessary.
B1319 Circuit of driver's door contact switch faulty (open circuit) REFER to: Interior Lighting - Vehicles Built Up To: 01/2005 (417-02 Interior Lighting, Diagnosis and Testing).
B1325 Interior lighting circuit faulty (short to voltage) REFER to: Interior Lighting - Vehicles Built Up To: 01/2005 (417-02 Interior Lighting, Diagnosis and Testing).
B1326 Interior lighting circuit faulty (short to ground) REFER to: Interior Lighting - Vehicles Built Up To: 01/2005 (417-02 Interior Lighting, Diagnosis and Testing).
B1327 Circuit of passenger door contact switch faulty (open circuit) REFER to: Interior Lighting - Vehicles Built Up To: 01/2005 (417-02 Interior Lighting, Diagnosis and Testing).
B1331 Circuit of luggage compartment light switch faulty (open circuit) REFER to: Interior Lighting - Vehicles Built Up To: 01/2005 (417-02 Interior Lighting, Diagnosis and Testing).
B1343 Circuit of rear window heating switch faulty REFER to:
Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Remote Keyless Entry (RKE) (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Fenster, Rahmen und Betätigungsmechanismen - gebaut ab 02/2005 Cabriolet (501-11, Diagnosis and Testing).
B1349 Circuit of heated rear window relay faulty (short to voltage) REFER to:
Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Remote Keyless Entry (RKE) (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Fenster, Rahmen und Betätigungsmechanismen - gebaut ab 02/2005 Cabriolet (501-11, Diagnosis and Testing).
B1350 Circuit of heated rear window relay faulty (short to ground) REFER to:
Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Remote Keyless Entry (RKE) (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Fenster, Rahmen und Betätigungsmechanismen - gebaut ab 02/2005 Cabriolet (501-11, Diagnosis and Testing).
B1426 Circuit of seatbelt warning lamp faulty (short to voltage) REFER to:
Safety Belt System (501-20A Safety Belt System, Diagnosis and Testing),
Aktives Rückhaltesystem - Cabriolet (501-20A, Diagnosis and Testing).
B1428 Circuit of seatbelt warning lamp faulty (open circuit or short to ground) REFER to:
Safety Belt System (501-20A Safety Belt System, Diagnosis and Testing),
Aktives Rückhaltesystem - Cabriolet (501-20A, Diagnosis and Testing).
B1439 Circuit of windshield wiper switch (intermittent wipe) faulty (open circuit) REFER to:
Wipers and Washers - Vehicles Built From: 02/2005 (501-16 Wipers and Washers, Diagnosis and Testing),
Scheibenwischer und Scheibenwaschanlage - gebaut ab 02/2005 Cabriolet (501-16, Diagnosis and Testing).
B1446 Circuit of windshield wiper limit switch faulty (running time from park position to park position too long) REFER to:
Wipers and Washers - Vehicles Built From: 02/2005 (501-16 Wipers and Washers, Diagnosis and Testing),
Scheibenwischer und Scheibenwaschanlage - gebaut ab 02/2005 Cabriolet (501-16, Diagnosis and Testing).
B1470 Circuit of headlamp switch (parking lights) faulty REFER to:
Parking, Rear and License Plate Lamps - Vehicles Built From: 02/2005 (417-01 Exterior Lighting, Diagnosis and Testing),
Parkleuchten, Rückleuchten, Kennzeichenleuchten - gebaut ab 02/2005 Cabriolet (417-01, Diagnosis and Testing).
B1519 Circuit of hood contact switch faulty (open circuit) Perform system test using WDS.
B1551 Circuit of tailgate unlocking switch faulty REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B1553 Circuit of tailgate unlocking switch faulty (short to voltage) REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B1554 Circuit of tailgate unlocking switch faulty (short to ground) REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B1611 Circuit of rear window wiper switch faulty REFER to: Wipers and Washers - Vehicles Built From: 02/2005 (501-16 Wipers and Washers, Diagnosis and Testing).
B1809 Circuit of reversing lamp switch faulty REFER to:
Reversing Lamps - Vehicles Built From: 02/2005 (417-01 Exterior Lighting, Diagnosis and Testing),
Rückfahrscheinwerfer - gebaut ab 02/2005 Cabriolet (417-01, Diagnosis and Testing).
B1875 Circuit of seat belt buckle switch faulty
B2108 Circuit of luggage compartment cover unlocking switch faulty (short to ground) REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B2112 Circuit of door locking switch faulty REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B2113 Circuit of windshield heating switch faulty (short to ground) REFER to:
Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Remote Keyless Entry (RKE) (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Fenster, Rahmen und Betätigungsmechanismen - gebaut ab 02/2005 Cabriolet (501-11, Diagnosis and Testing).
B2114 Circuit of windshield washer system switch faulty (short to ground) REFER to:
Wipers and Washers - Vehicles Built From: 02/2005 (501-16 Wipers and Washers, Diagnosis and Testing),
Scheibenwischer und Scheibenwaschanlage - gebaut ab 02/2005 Cabriolet (501-16, Diagnosis and Testing).
B2115 Circuit of rear window washer system switch faulty (short to ground) REFER to: Wipers and Washers - Vehicles Built From: 02/2005 (501-16 Wipers and Washers, Diagnosis and Testing).
B2116 Circuit of door unlocking switch faulty REFER to: Locks, Latches and Entry Systems (501-14 Handles, Locks, Latches and Entry Systems, Diagnosis and Testing).
B2248 Circuit of heated windshield relay faulty (short to voltage) REFER to:
Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Remote Keyless Entry (RKE) (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Fenster, Rahmen und Betätigungsmechanismen - gebaut ab 02/2005 Cabriolet (501-11, Diagnosis and Testing).
B2256 Circuit of heated windshield relay faulty (open circuit or short to ground) REFER to:
Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Glass, Frames and Mechanisms - Vehicles With: Remote Keyless Entry (RKE) (501-11 Glass, Frames and Mechanisms, Diagnosis and Testing),
Fenster, Rahmen und Betätigungsmechanismen - gebaut ab 02/2005 Cabriolet (501-11, Diagnosis and Testing).
B2279 Circuit of engine running signal faulty (short to voltage) Perform system test using WDS.
B2494 Circuit of anti-theft alarm horn faulty (short to voltage) Perform system test using WDS.
B2496 Circuit of anti-theft alarm horn faulty (short to ground) Perform system test using WDS.
B2555 Circuit of interior lighting faulty (short to voltage) REFER to: Interior Lighting - Vehicles Built Up To: 01/2005 (417-02 Interior Lighting, Diagnosis and Testing).
B2665 Circuit of alarm horn with battery faulty (short to voltage) Perform system test using WDS.

Symptom Chart

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 - Vehicles Built From: 02/2005 (418-00 Module Communications Network, Diagnosis and Testing).

System Check

PINPOINT TEST A : VOLTAGE SUPPLY (TERM. 15) FAULTY
TEST CONDITIONS DETAILS/RESULTS/ACTIONS
A1: CHECK FUSE F17
1
Ignition switch in position 0.
2
CHECK Fuse F17 (CJB).

Is the fuse OK?
Yes
GO to A2.
No
RENEW fuse F17 (15 A). CHECK the operation of the system. If the fuse blows again, LOCATE and REPAIR the short using the Wiring Diagrams.
A2: CHECK THE VOLTAGE AT FUSE F17
1
Connect Fuse F17 (CJB).
2
Ignition switch in position II.
3
Measure the voltage between fuse F17 (15 A) and ground.

Does the meter display battery voltage?
Yes
GO to A3.
No
CHECK the voltage supply to fuse F17 and REPAIR it with the aid of the wiring diagrams. CHECK the operation of the system.
A3: CHECK CIRCUIT BETWEEN FUSE F17 AND GENERIC ELECTRONIC MODULE (GEM) FOR SHORT TO VOLTAGE
1
Ignition switch in position 0.
2
Disconnect Connector C173 from GEM.

3
Measure the voltage between the GEM, connector C173, pin 10, circuit 14-DK20 (VT/OG), wiring harness side and ground.

Is a voltage measured?
Yes
LOCATE and RECTIFY the short to voltage supply in the circuits connected to soldered connection S13 with the aid of the Wiring Diagrams. CHECK the operation of the system.
No
GO to A4.
A4: CHECK CIRCUIT BETWEEN FUSE F17 AND GENERIC ELECTRONIC MODULE (GEM) FOR SHORT TO GROUND

1
Measure the resistance between the GEM, connector C173, pin 10, circuit 14-DK20 (VT/OG), wiring harness side and ground.

Is a resistance of more than 10,000 Ohm measured?
Yes
TEST the GEM and RENEW as necessary. CHECK the operation of the system.
No
LOCATE and RECTIFY the short to ground in the circuits connected to soldered connection S13 with the aid of the Wiring Diagrams. CHECK the operation of the system.

5 Body and Paint > < Generic Electronic Module (GEM)