Power Seat Position Is Not Memorized
SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Seat Position Memory System): Power Seat Position is not Memorized
Power Seat Position is not Memorized
DESCRIPTION
The driver side seat memory switch sends signals to the position control ECU LH to memorize a given seat position via the multiplex network master switch assembly. The passenger side seat memory switch signals the position control ECU RH to memorize a given seat position via the front multiplex network door ECU RH. This memory system does not use a seat position sensor. The seat position is detected by counting pluses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The seat memory switch sends signals to the position control ECU to return to one of the memorized positions.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK FRONT POWER SEAT CONTROL FUNCTION
(a) Check that each function of the power seat operates normally by using the front power seat switches.
OK:
Each function of power seat operates normally by using seat switches
NG -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
OK -- Continue to next step.
2. CHECK SEAT MEMORY SWITCH FUNCTION (SEAT POSITION MEMORY FUNCTION)
(a) Perform a memory operation properly. Check that the buzzer sounds to indicate the completion of the memory operation.
NOTICE:
- The seat position will not be recorded if the SET switch and 2 or more of the memory switches (for example, M1 and M2) are pressed simultaneously.
- If a memorizing operation has failed, release all switches. The seat memory function does not operate unless the switches are released.
OK:
Seat memory switch function operates normally.
Result:
C -- USE SIMULATION METHOD TO CHECK
B -- READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH RH)
A -- Continue to next step.
3. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH LH)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / MSW / Data List.
(e) Read the Data List according to the display on the Techstream.
MSW
OK:
On tester screen, each item changes between ON and OFF according to above chart.
NG -- INSPECT SEAT MEMORY SWITCH LH (DRIVER SIDE)
OK -- Continue to next step.
4. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH LH)
(a) Enter the following menus: Body Electrical / Driver Seat / Data List.
(b) Read the Data List according to the display on the Techstream.
Driver Seat
OK:
On tester screen, each item is displayed according to above chart.
NG -- REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH
5. INSPECT SEAT MEMORY SWITCH LH (DRIVER SIDE)
(a) Remove the seat memory switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
NG -- REPLACE SEAT MEMORY SWITCH LH
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR
(a) Disconnect the Q13 and Q10 switch connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH LH - BODY GROUND)
(a) Disconnect the Q10 switch connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
NG -- CHECK HARNESS AND CONNECTOR
OK -- REPLACE MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY
8. CHECK HARNESS AND CONNECTOR
(a) Disconnect the M9 ECU connector.
(b) Disconnect the Q10 switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH
9. READ VALUE USING TECHSTREAM (SEAT MEMORY SWITCH RH)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / MSW / Data List.
(e) Read the Data List according to the display on the Techstream.
MSW
OK:
On tester screen, each item is displayed according to above chart.
NG -- INSPECT SEAT MEMORY SWITCH RH (PASSENGER SIDE)
OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY RH
10. INSPECT SEAT MEMORY SWITCH RH (PASSENGER SIDE)
(a) Remove the seat memory switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
NG -- REPLACE SEAT MEMORY SWITCH RH
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR
(a) Disconnect the M4 ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH