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:

Disassembly
HINT: On the RH side, use the same procedures as on the LH side. 1. REMOVE FRONT DOOR LOWER FRAME BRACKET GARNISH LH Using a screwdriver, disengage the clip and claw, and remove the garnish. HINT: Tape the screwdriver tip before use. 2. REMOVE FRONT DOOR INSIDE HANDLE BEZEL PLUG LH ...

Installation
1. INSTALL STABILIZER BAR FRONT 2. INSTALL FRONT STABILIZER BAR BUSH NO.1 (a) Install the front stabilizer bar bush No. 1. HINT: Install the bushing to the outer side of the bushing stopper on the stabilizer bar as shown in the illustration. 4. INSTALL RACK & PINION POWER STEERING GEA ...

Rear wheel alignment
ADJUSTMENT NOTICE: For vehicles equipped with VSC, if wheel alignment has been adjusted, and if suspension or underbody components have been removed/installed or replaced, be sure to perform the following initialization procedure in order for the system to function normally: 1. Disconnect the ...

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