JAGUAR XJ6 1994 2.G Electrical Diagnostic Manual

Electrical rl
Electrical schematic - Fault Code 32
0
10
1 4
U 4
J86-1672
1. Instrument Panel Fuse 6. Passenger-side Air Bag 2. Engine Compartment Fuse 7. RH Impact Sensor
3. Safing Sensor 8. LH Impact Sensor
4. Cable Reel Cassettes 9. Air Bag MIL Lamp
5. Driver
-side Air Bag 10. Diagnostic Module
Fig. 1
X300 EDM 15.1 - 25 Issue 1 August 1994

Electrical rl
FAULT CODE 33
Passenger-side Air BAg Circuit High Resistance or Open
Normal Operation
The DM monitors the resistance between pins 8 and 9. The value of this resistance is normally between 0.99 and 1.29. If the resistance measured exceeds 49 the MIL Lamp will illuminate and fault code 33 will be present, indicating high resistance or open circuit on the air bag circuit.
Possible Causes
0 Faulty passenger-side air bag wiring.
0 Open circuit or high resistance in passenger-side air bag.
Fault Diagnosis
1. Circuit - check
. Disarm SRS system and disconnect DM.
. Disconnect DM and remove plastic locking wedge from black DM harness connector.
Measure resistance across harness connections to passenger air bag, wires RP and KP:
. Is resistance value greater than 2.29 ?
Yes - Examine harness wiring and connections for open circuit, rectify as necessary.
No - Proceed to step 2.
2. Code verification
. Reconnect DM.
. Switch on the ignition and wait 30 seconds.
Yes
- Renew DM.
No - Proceed to step 3.
Is code 33 still present ?
3. Code 33 -check
. Switch off the ignition.
. Arm the SRS system.
. Is code 33 still present 7
Yes - Renew passenger-side air bag.
No - Examine harness wiring and connectors for intermittent open circuit.
4. On completion.
. Re-arm and verify the SRS system.
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Issue 1 August 1994 15.1 - 26 X300 EDM

Electrical schematic - Fault Code 33
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0
0
0
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586-1673
1. Instrument Panel Fuse 6. Passenger-side Air Bag
2. Engine Compartment Fuse 7.
RH Impact Sensor 3. Safing Sensor 8. LH Impact Sensor
4. Cable Reel Cassettes 9. Air Bag MIL Lamp
5. Driver
-side Air Bag 10.
Diagnostic Module
Fia. 1
X300 EDM 15.1 - 27 Issue 1 August 1994

rl E I ect r ica I
FAULT CODE 34
Driver-side Air Bag Circuit Low Resistance or Shorted
Normal Operation
The DM monitors the resistance between pins 10 and 11. The value of this resistance is the sum of the two cable reel
cassettes and the air bag and is normally between 1.552 and 2Q. If the resistance measured is less than 0.752 the MIL Lamp will illuminate and fault code 34 will be present, indicating low resistance or short circuit on the air bag circuit.
Possible Causes
0 Poor connection of cable reel cassettes.
0 Worn cable reel cassette connectors.
0 Short circuit in cable reel cassette.
0 Poor connection of air bag harness.
0 Short circuit across air bag terminals.
Fault Diagnosis
1. Resistance - check
. Disarm the SRS system and disconnect the driver-side air bag.
rn Disconnect DM and remove plastic locking wedge from black harness connector.
. Measure resistance across harness connections to driver-side air bag, wires RP and KN.
. Does resistance value indicate open circuit.
Yes
- Proceed to step 2.
No - Proceed to step 3.
2. Diagnostic Module -check
Install air bag simulator in place of cable reel cassette at steering column base.
. Re-connect DM.
. Switch on the ignition and wait 30 seconds.
rn Is code 34 still present ?
Yes - Renew DM.
No - Examine shorting bar on driver-side air bag connector for correct operation, rectify if necessary. Renew air bag
module if shorting bar is functioning correctly.
3. Harness -check
. Measure resistance across harness connections to driver-side air bag, wires RP and KN.
. Does resistance value indicate open circuit 7
Yes -
. Examine shorting bar on cable reel cassette connector for correct operation, rectify if necessary.
. Renew cable reel cassette if shorting bar is functioning correctly.
NO -
Inspect harness wiring, cable reel cassettes and terminals for short circuit. Rectify as necessary.
4. On completion
. Arm and verify the SRS system.

Electrical
Electrical schematic - Fault Code 34
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10
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P10,
A 4
I
(c KN I I L-J
4
J86-1674
1. Instrument Panel Fuse 6. Passenger-side Air Bag
2. Engine Compartment Fuse
7. RH Impact Sensor 3. Safing Sensor 8. LH Impact Sensor
4. Cable Reel Cassettes 9.
Air Bag MIL Lamp 5. Driver-side Air Bag 10. Diagnostic Module
Fig.
1
X300 EDM 15.1 - 29 Issue 1 August 1994

FAULT CODE 35
Passenger-side Air Bag Circuit L o w Resistance or Shorted
Normal Operation
The DM monitors the resistance between pins 8 and 9. The value of this resistance is normally between 0.9Q and 1.2Q. If the resistance measured is less than 0.7Q the MIL Lamp will illuminate and fault code 35 will be present, indicating
low resistance or short circuit on the air bag circuit.
Possible Causes
0 Shorting between DM pins 8 and 9, passenger-side air bag not fitted.
0 Poor connection of air bag harness.
0 Faulty air bag harness connector.
0 Short circuit in air bag harness.
0 Short circuit across passenger-side air bag terminals.
Fault Diagnosis
8 Disarm the SRS system and disconnect the passenger-side air bag.
8 Disconnect the DM and remove the plastic locking wedge from the black harness connector.
8 Measure resistance across harness connections to passenger-side air bag, wires RP and Kf?
8 Does resistance indicate open circuit ?
Yes - Proceed to step 2.
No - Inspect harness wiring, cable reel cassettes and terminals for short circuit. Rectify as necessary.
2. Code verification
8 Install air bag simulator in place of passenger-side air bag module.
8 Re-connect DM.
8 Switch on the ignition and wait 30 seconds.
8 Is code 35 still present ?
Yes - Renew DM
8 Examine shorting bar on driver-side air bag connector for correct operation, rectify if necessary.
8 Renew air bag module if shorting bar is operating correctly
NO -
3. on completion
8 Arm and verify the SRS system.
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Issue 1 August 1994 15.1 - 30 X300 EDM

Electrical n
Electrical schematic - Fault Code 35
0
J86-1675
1. Instrument Panel Fuse 6. Passenger-side Air Bag
2. Engine Compartment Fuse 7. RH Impact Sensor 3. Safing Sensor 8. LH Impact Sensor 4. Cable Reel Cassettes 9. Air Bag MIL Lamp 5. Driver-side Air Bag 10. Diagnostic Module
Fig.
1

rl E I ect r ica I
FAULT CODE 41
Front Right Impact Sensor Feed / Return Open Circuit
Normal Operation
The DM monitors and compares the voltages on pins 2 and 17. the voltage on both pins should be identical. If a discrep- ancy between the two measurements is detected the MIL Lamp will illuminate and fault code 41 will be present, indicat- ing open circuit between DM and RH impact sensor.
Possible Causes
0 Harness open circuit between DM pins 2 and 17 and sensor.
0 Internal open circuit in RH impact sensor wiring.
Fault Diagnosis
1. Circuit - check
. Disarm the SRS system.
. Disconnect DM.
. Measure resistance across harness connections to RH impact sensor, wires KU and ON.
. Is the resistance less than 251 ?
Yes - Renew RH impact sensor.
No - Proceed to step 2.
2.
Resistance -check
Disconnect RH impact sensor from main harness.
. Measure resistance across sensor terminals 1 and 2.
. Is resistance reading less than 251.
Yes - Examine harness wiring and connectors for open circuit.
No - Renew RH impact sensor.
4. On completion.
. Arm and verify the SRS system.
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0
X300 EDM 15.1 - 32 Issue 1 August 1994

Electricalschematic - Fault Code 41
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0
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7
J86-1699
1.
Instrument Panel Fuse 6. Passenger-side Air Bag 2. Engine Compartment Fuse 7. RH Impact Sensor
3. Safing Sensor 8. LH Impact Sensor
4. Cable Reel Cassettes 9. Air Bag MIL Lamp
5. Driver
-side Air Bag 10. Diagnostic
Module
Fig. 1
Issue 1 August 1994 X300 EDM 15.1 - 33

E I ect r ical rl
FAULT CODE 42
Front L eft Impact Sensor Feed / Return Open Circuit
Normal Operation
The DM monitors and compares the voltages on pins 6 and 18. The voltage on both pins should be identical. If a dis- crepancy between the two measurements is detected the MIL Lamp will illuminate and fault code 42 will be present,
indicating open circuit between DM and LH impact sensor.
Possible Causes
0 Harness open circuit between DM pins 6 and 18 and the sensor.
0 Internal open circuit in LH impact sensor wiring.
Fault Diagnosis
1. Circuit - check
. Disarm the SRS system.
Disconnect DM.
. Measure resistance across harness connections to LH impact sensor, wires KG and YU.
. Is the resistance less than 28 ?
Yes - Renew LH impact sensor.
No - Proceed to step 2.
2. Resistance -check
. Disconnect LH impact sensor from main harness.
. Measure resistance across sensor terminals 1 and 2.
. Is resistance reading less than 28.
Yes
- Examine harness wiring and connectors for open circuit.
No - Renew LH impact sensor.
3. On completion.
. Arm and verify the SRS system.
Issue 1 August 1994 15.1 - 34 X300 EDM