Vauxhall Workshop Service and Repair Manuals

Test

Work Order Description

Nominal Value

Check: Transition Resistance of Voltage Supply Circuit

• Ignition OFF
• Disconnect wiring harness connector from:
  A75 Assembly - Electrical Power Steering
• Connect test lamp ( 55 W ) and multimeter in parallel and measure voltage between the following terminals:
  A75 Assembly - Electrical Power Steering
  Wiring harness connector colour RD
  &
  Ground

Note:

Wiring colours: BK=Black, BN=Brown, BU=Blue, GD=Gold, GN=Green, GY=Grey, OG=Orange, PK=Pink, RD=Red, SR=Silver, TQ=Turquoise, VT=Violet, WH=White, YE=Yellow,
L=Light, D=Dark

greater than 11 V

Check: Transition Resistance of Voltage Supply Circuit

• Connect test lamp ( 55 W ) and multimeter in parallel and measure voltage between the following terminals:
  A75 Assembly - Electrical Power Steering
  Wiring harness connector colour RD
  &
  A75 Assembly - Electrical Power Steering
  Wiring harness connector colour BN

Note:

Wiring colours: BK=Black, BN=Brown, BU=Blue, GD=Gold, GN=Green, GY=Grey, OG=Orange, PK=Pink, RD=Red, SR=Silver, TQ=Turquoise, VT=Violet, WH=White, YE=Yellow,
L=Light, D=Dark

greater than 11 V

Check: Circuit Interruption of Ground Circuit

• Check the following functional group for proper operation:
  Ground connection of the control unit case
  and
  Check if all ground connections are clean, tight and installed properly

Is the ground connection okay?

Check: Transition Resistance of Voltage Supply Circuit

• Ignition ON
• Connect test lamp ( 21 W ) and multimeter in parallel and measure voltage between the following terminals:
  A75 Assembly - Electrical Power Steering
  Wiring harness connector colour BK
  &
  Ground

Note:

Wiring colours: BK=Black, BN=Brown, BU=Blue, GD=Gold, GN=Green, GY=Grey, OG=Orange, PK=Pink, RD=Red, SR=Silver, TQ=Turquoise, VT=Violet, WH=White, YE=Yellow,
L=Light, D=Dark

greater than 11 V

Check: Transition Resistance of Voltage Supply Circuit

• Engine running
  Increase engine speed to 3000 rpm
  Connect test lamp ( 55 W ) and multimeter in parallel and measure voltage between the following terminals:
  A75 Assembly - Electrical Power Steering
  Wiring harness connector colour RD
  &
  Ground

Note:

Wiring colours: BK=Black, BN=Brown, BU=Blue, GD=Gold, GN=Green, GY=Grey, OG=Orange, PK=Pink, RD=Red, SR=Silver, TQ=Turquoise, VT=Violet, WH=White, YE=Yellow,
L=Light, D=Dark

13 ... 14.5 V

Check: Transition Resistance of Voltage Supply Circuit

• Ignition OFF
• Remove electrical component from socket:
  (Vehicle with REC (Rear Electronic Module)) FE27 (Vehicle without REC (Rear Electronic Module)) FE29 Fuse
• Ignition ON
• Connect test lamp ( 21 W ) and multimeter in parallel and measure voltage between the following terminals:
  (Vehicle with REC (Rear Electronic Module)) FE27 (Vehicle without REC (Rear Electronic Module)) FE29 Fuse
  Input contact
  &
  Ground

greater than 11 V

greater than 11 V

Check: Transition Resistance of Voltage Supply Circuit

• Ignition OFF
• Remove electrical component from socket:
  K3_X125 Relay - Terminal 15
• Ignition ON
• Connect test lamp ( 21 W ) and multimeter in parallel and measure voltage between the following terminals:
  K3_X125 Relay - Terminal 15
  Socket Terminal 30
  &
  Ground

greater than 11 V

Result

Cause Of Fault

• Defective component:
  A75 Assembly - Electrical Power Steering

Important:

Reset the concerned control unit with the diagnostic tester before replacing it. In order to do that, call up the "RESET" function from the PROGRAMMING menu of the current system on the diagnostic tester.

• Defective component:
  G8 Alternator

• High transition resistance between:
  X125 Underhood Electronic Module
  Socket Terminal (Vehicle with REC (Rear Electronic Module)) 40 (XE2) (Vehicle without REC (Rear Electronic Module)) 23 (XE3)
  &
  A75 Assembly - Electrical Power Steering
  Wiring harness connector colour RD

or

• Defective component:
  X125 Underhood Electronic Module

Important:

Reset the concerned control unit with the diagnostic tester before replacing it. In order to do that, call up the "RESET" function from the PROGRAMMING menu of the current system on the diagnostic tester.

Note:

Wiring colours: BK=Black, BN=Brown, BU=Blue, GD=Gold, GN=Green, GY=Grey, OG=Orange, PK=Pink, RD=Red, SR=Silver, TQ=Turquoise, VT=Violet, WH=White, YE=Yellow,
L=Light, D=Dark

• Defective component:
  K3_X125 Relay - Terminal 15
  or
  X125 Underhood Electronic Module

Important:

Reset the concerned control unit with the diagnostic tester before replacing it. In order to do that, call up the "RESET" function from the PROGRAMMING menu of the current system on the diagnostic tester.

Note:

The replacement of the components must be done in the listed order.

The system must be checked for proper operation after every replacement.

• High transition resistance between:
  G1 Battery
  Wiring harness connector (wiring harness side) terminal 30
  &
  X125 Underhood Electronic Module

or

• Defective component:
  X125 Underhood Electronic Module

Important:

Reset the concerned control unit with the diagnostic tester before replacing it. In order to do that, call up the "RESET" function from the PROGRAMMING menu of the current system on the diagnostic tester.

• Defective component:
  Ground connection of the control unit case

• High transition resistance between:
  A75 Assembly - Electrical Power Steering
  Wiring harness connector colour BN
  &
  Ground

Note:

Wiring colours: BK=Black, BN=Brown, BU=Blue, GD=Gold, GN=Green, GY=Grey, OG=Orange, PK=Pink, RD=Red, SR=Silver, TQ=Turquoise, VT=Violet, WH=White, YE=Yellow,
L=Light, D=Dark

• High transition resistance between:
  FB3 Fuse
  Output contact
  &
  A75 Assembly - Electrical Power Steering
  Wiring harness connector colour RD
  or
  G1 Battery
  Wiring harness connector (wiring harness side) terminal 30
  &
  FB3 Fuse
  Input contact

Note:

Wiring colours: BK=Black, BN=Brown, BU=Blue, GD=Gold, GN=Green, GY=Grey, OG=Orange, PK=Pink, RD=Red, SR=Silver, TQ=Turquoise, VT=Violet, WH=White, YE=Yellow,
L=Light, D=Dark