Toyota RAV4 manuals

Toyota Sienna Service Manual: Problem symptoms table

HINT:

If the malfunction still exists after checking and confirming that all circuits and components are normal, replace the ECU.

FRONT POWER SEAT CONTROL SYSTEM ( w/o MEMORY)

Symptom

Suspected area

Power seat does not operate (slide, front vertical, lifter, reclining).
  1. P/SEAT fuse
  2. Power seat switch
  3. Wire harness or connector
Slide operation function only does not operate.
  1. Power seat switch
  2. Front seat frame with adjuster (LH side slide motor)
  3. Front seat frame with adjuster (RH side slide motor)
  4. Wire harness or connector
Front vertical operation function only does not operate.
  1. Power seat switch
  2. Front seat frame with adjuster (LH side front vertical motor)
  3. Wire harness or connector
Lifter operation function only does not operate.
  1. Power seat switch
  2. Front seat frame with adjuster (LH side lifter motor)
  3. Wire harness or connector
Reclining operation function only does not operate.
  1. Power seat switch
  2. Front seat frame with adjuster (LH side reclining motor)
  3.  Front seat frame with adjuster (RH side reclining motor)
  4. Wire harness or connector
Lumbar support operation function only does not operate (Driver side only).
  1. Front power seat lumbar switch
  2. Lumbar support adjuster assembly
  3. Wire harness or connector

FRONT POWER SEAT CONTROL SYSTEM ( w/ MEMORY)

Symptom

Suspected area

Power seat does not operate (manual or memorized position).
  1. ECU power source circuit
  2. Position control ECU and switch assembly (power seat control switch and ECU)
One of the power seat functions does not operate (manual or memorized position).
  1. Power seat motor circuit
  2. Position control ECU and switch assembly (power seat control switch and ECU)
One or all manual seat functions do not operate (memorized positions OK).
  1. Position control ECU and switch assembly (power seat control switch
Memory function does not operate.
  1. Memory switch circuit
  2. Multiplex communication system
  3. Position control ECU and switch assembly (power seat control switch
No memory functions operate or all memory functions operate briefly
  1. ECU power source circuit
  2. Position control ECU and switch assembly (power seat control switch
One memory function does not operate or operates briefly and then stops
  1. Front seat frame with adjuster (power seat motor)
  2. Position control ECU and switch assembly (power seat control switch
How to proceed with troubleshooting
HINT:  Use this procedure to troubleshoot the front power seat control system.  The intelligent tester should be used in steps 3 and 5. 1 VEHICLE BROUGHT TO WORKSHOP 2 CUSTOMER P ...

Terminals of ECU
1. POSITION CONTROL ECU AND SWITCH ASSEMBLY (POWER SEAT CONTROL SWITCH AND ECU)  Disconnect the P58 and P59 connectors. Check the voltage of each terminal of the wire harness sid ...

Other materials:

Diagnosis system
1. CHECK DLC3  The ECU uses ISO 15765-4 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and meets the ISO 15765-4 format. NOTICE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition s ...

Removal
1. REMOVE V-BANK COVER SUB-ASSEMBLY (See page EM-28) 2. REMOVE NO. 1 ENGINE UNDER COVER (See page EM-26) 3. DRAIN ENGINE COOLANT (See page CO-6) 4. REMOVE NO. 2 AIR CLEANER INLET (See page EM- 28) 5. REMOVE BATTERY (See page EM-26) 6. REMOVE FRONT BUMPER ASSEMBLY (See page ET-3) 7. REMOVE ...

Reassembly
1. APPLY HIGH TEMPERATURE GREASE (a) Apply the high temperature grease to the surface on which the shoe and backing plate attach. 2. INSTALL PARKING BRAKE SHOE LEVER LH (a) Install the shoe lever and shim to the rear shoe with a new C-washer. (b) Using a feeler gauge, measure the clearance. ...

В© 2011-2019 Copyright www.tsienna.net