Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 159 Factory Service Manual (2005-2011)23 · Fault diagnosis
23 · Diagnostics

Front seat adjustments (all) not working

Make
Alfa Romeo
Model
159 Factory Service Manual
Year
2005–2011
Section
Seats › Front seat adjustments (all) not working
Fault diagnosisFront seat adjustments (all) not working

FRONT SEAT ADJUSTMENTS (ALL) NOT WORKING

All electric front seat functions (movement/adjustment) fail to work.

1CHECK ON CONDITION OF CIRCUIT PROTECTIVE FUSEALL OKPROBLEMS ENCOUNTEREDACTION

Check the condition of the circuit protective fuse see wiring diagram

See E3076 ELECTRICALLY-ADJUSTABLE SEATS

Move on to Step 2Protective fuse blownReplace the blown fuse
2CHECK ON SWITCH STATUSALL OKPROBLEMS ENCOUNTEREDACTION

Select the following control unit at the diagnostic equipment:

Driver''s/passenger seat control unit.

Check the value of the following parameter:

Sliding/seat lifting/backrest switch and check that it indicates released when the switch is released and indicates pressed when the switch is pressed.

Move on to Step 6There is no change in the status of the switch.Move on to Step 3
3CHECK ON WIRING CONNECTIONS AT SLIDING/SEAT LIFTING/BACKREST SWITCHALL OKPROBLEMS ENCOUNTEREDACTION

Check the connection for the wiring at the electric seat control switch.

Also check for any oxidation/impurities at the connector/switch.

Move on to Step 41.Switch wiring connector detached or badly positioned on seat mounting.1.Fit connector correctly on switch.
2. Presence of oxidation/impurities at connector/control unit.2.Eliminate oxidation/impurities at connector/switch.
4CHECK ON WIRING CONNECTIONS AT CONTROL UNITALL OKPROBLEMS ENCOUNTEREDACTION

Check the connection for the wiring at the electric seat control unit.

Also check for any oxidation/impurities at the connector/control unit.

Move on to Step 51.Switch wiring connector detached or badly positioned on seat control unit.1.Fit connector correctly on control unit
2. Presence of oxidation/impurities at connector/control unit2.Eliminate oxidation/impurities at connector/control unit.
5CHECK ON OPERATION OF SLIDING/SEAT LIFTING/BACKREST SWITCHALL OKPROBLEMS ENCOUNTEREDACTION
Check that the sliding/seat lifting/backrest switch is working properlyMove on to Step 11Switch not working correctly.

Replace the switch

Op. 7045J50

6CHECKS USING DIAGNOSTIC EQUIPMENTALL OKPROBLEMS ENCOUNTEREDACTION

Keeping the diagnostic equipment connected, check:

that the sliding/seat lifting/backrest actuator is working properly through active diagnosis

Move on to Step 11Incorrect operation of sliding/seat lifting/backrest actuatorMove on to Step 7
7CHECK ON CONNECTION AT SLIDING/SEAT LIFTING/BACKREST MOTORALL OKPROBLEMS ENCOUNTEREDACTION

Check that the connection is correctly attached to the motor

Also check for any oxidation/impurities at the connector/motor.

Move on to Step 81.Connectors at motor detached or badly positioned.1.Fit connector correctly on motor
2.Presence of oxidation/impurities at connector/motor.2.Eliminate oxidation/impurities at connector/motor.
8SEAT WIRING CHECKALL OKPROBLEMS ENCOUNTEREDACTION
Check the connection between the seat connection and the floor connectionMove on to Step 9Seat connectors detached from vehicle floor connectorsRestore the correct connections between the seat and the floor connections
9CHECK ON ELECTRICAL SEAT WIRINGALL OKPROBLEMS ENCOUNTEREDACTION
Check the condition of the electric seat wiringMove on to Step 10Presence of cuts/tears to seat wiring.

Replace cut/broken wiring see wiring diagram

See E3076 ELECTRICALLY-ADJUSTABLE SEATS

10CHECK ON SLIDING/SEAT LIFTING/BACKREST ADJUSTMENT MOTORSALL OKPROBLEMS ENCOUNTEREDACTION
Check that the sliding/seat lifting/backrest movement motors are working properly.Move on to Step 111.Sliding adjustment motor not working properly.

1.Replace sliding adjustment motor

Op. 7045J26 FRONT SEAT SLIDE MOTOR, L/H OR R/H - R+R FOLLOWING ELECTRICAL WIRING CHECK

2. Seat lifting adjustment motor not working properly.

2. Replace the seat lifting adjustment motor

Op. 7045J30 FRONT SEAT LIFTING MOTOR, LEFT OR RIGHT - R.R. FOLLOWING ELECTRICAL WIRING CHECK

3. Backrest adjustment motor not working properly.

Replace the backrest adjustment motor

Op. 7045J34 FRONT SEAT BACKREST ANGLE MOTOR, LEFT OR RIGHT - R.R. FOLLOWING ELECTRICAL WIRING CHECK

11DRIVER''S/PASSENGER SEAT CONTROL UNITALL OKPROBLEMS ENCOUNTEREDACTION

Replace the driver''s/passenger seat control unit

Op. 7045J36 SEAT MOVEMENT ECU R R FOLLOWING ELECTRICAL CIRCUIT CHECK

End of diagnosisThe fault persistsContact technical service for further information on the problem

Parts & tools for this job Staging For 2005 Alfa Romeo 159

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