Front Passenger Side Seat Memory Switch Circuit

DESCRIPTION

The front passenger side seat memory switch sends signals to the front passenger side outer mirror control ECU via the multiplex communication system to memorize a given seat position. This memory system does not use a position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The front passenger side seat memory switch is later used to send signals to the front passenger side front power seat switch (position control ECU) to return the seat to one of the memorized positions.

1. A/T:
   The front passenger side power seat memory operation can be performed only when the engine switch is on (IG) and the shift lever is in the P position.
   
2. M/T:
   The front passenger side power seat memory switch operation can be performed only when the engine switch is on (IG), apply the parking brake, and seat the vehicle speed below 3 km/h (1.9 mph).
   

WIRING DIAGRAM

INSPECTION PROCEDURE

1. READ VALUE OF INTELLIGENT TESTER (SEAT MEMORY SWITCH)

1. Connect the intelligent tester to the DLC3.

2. Turn the engine switch on (IG).

3. Read the DATA LIST.

   SEAT: 

   Item	Measurement Item/Range (Display)	Normal Condition	Diagnostic Note
   Seat Memory No. 1	M1 switch signal / ON or OFF	ON: M1 switch is ON OFF: M1 switch is OFF	-
   Seat Memory No. 2	M2 switch signal / ON or OFF	ON: M2 switch is ON OFF: M2 switch is OFF	-
   Seat Memory No. 3	M3 switch signal / ON or OFF	ON: M3 switch is ON OFF: M3 switch is OFF	-
   Seat SET Switch	SET switch signal / ON or OFF	ON: SET switch is ON OFF: SET switch is OFF	-

   OK:

   On the tester screen, each item changes between ON and OFF according to the above chart.
   

NG	Go to step 2

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT SEAT MEMORY SWITCH

1. Remove the seat memory switch.

2. LHD

   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance:

      Tester Connection	Switch Position	Specified Condition
      1 (MMRY) - 5 (E)	SET switch is pressed	Below 1 Ω
      2 (1) - 5 (E)	M1 switch is pressed	Below 1 Ω
      3 (2) - 5 (E)	M2 switch is pressed	Below 1 Ω
      4 (3) - 5 (E)	M3 switch is pressed	Below 1 Ω
      1 (MMRY) - 5 (E)	SET switch is not pressed	10 kΩ or higher
      2 (1) - 5 (E)	M1 switch is not pressed	10 kΩ or higher
      3 (2) - 5 (E)	M2 switch is not pressed	10 kΩ or higher
      4 (3) - 5 (E)	SET switch is not pressed	10 kΩ or higher

3. RHD

   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance:

      Tester Connection	Switch Position	Specified Condition
      1 (MRY) - 5 (E)	SET switch is pressed	Below 1 Ω
      2 (M1) - 5 (E)	M1 switch is pressed	Below 1 Ω
      3 (M2) - 5 (E)	M2 switch is pressed	Below 1 Ω
      4 (M3) - 5 (E)	M3 switch is pressed	Below 1 Ω
      1 (MRY) - 5 (E)	SET switch is not pressed	10 kΩ or higher
      2 (M1) - 5 (E)	M1 switch is not pressed	10 kΩ or higher
      3 (M2) - 5 (E)	M2 switch is not pressed	10 kΩ or higher
      4 (M3) - 5 (E)	M3 switch is not pressed	10 kΩ or higher

NG	REPLACE SEAT MEMORY SWITCH

OK

3. CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH RH CIRCUIT)

1. LHD

   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance:

      Tester Connection	Specified Condition
      L7-2 (1) - L7-5 (E)	10 kΩ or higher
      L7-3 (2) - L7-5 (E)	10 kΩ or higher
      L7-4 (3) - L7-5 (E)	10 kΩ or higher
      L7-1 (MMRY) - L7-5 (E)	10 kΩ or higher
      L7-5 (E) - Body ground	Below 1 Ω

2. RHD

   1. Measure the resistance according to the value(s) in the table below.

      Standard resistance:

      Tester Connection	Specified Condition
      M6-2 (M1) - M6-5 (E))	10 kΩ or higher
      M6-3 (M2) - M6-5 (E)	10 kΩ or higher
      M6-4 (M3) - M6-5 (E)	10 kΩ or higher
      M6-1 (MRY) - M6-5 (E)	10 kΩ or higher
      M6-5 (E) - Body ground	Below 1 Ω

NG	Go to step 4

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4. CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU - SEAT MEMORY SWITCH, BODY GROUND)

1. LHD

   1. Disconnect the outer mirror control ECU RH connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance:

      Tester Connection	Specified Condition
      L10-22 (M1) - L7-2 (1)	Below 1 Ω
      L10-23 (M2) - L7-3 (2)	Below 1 Ω
      L10-24 (M3) - L7-4 (3)	Below 1 Ω
      L10-25 (MM) - L7-1 (MMRY)	Below 1 Ω
      L10-26 (MSWE) - L7-5 (E)	Below 1 Ω
      L10-26 (MSWE) - Body ground	Below 1 Ω
      L7-5 (E) - Body ground	Below 1 Ω

2. RHD

   1. Disconnect the outer mirror control ECU LH connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance:

      Tester Connection	Specified Condition
      M10-22 (M1) - M6-2 (M1)	Below 1 Ω
      M10-23 (M2) - M6-3 (M2)	Below 1 Ω
      M10-24 (M3) - M6-4 (M3)	Below 1 Ω
      M10-25 (MM) - M6-1 (MM)	Below 1 Ω
      M10-26 (MSWE) - M6-5 (E)	Below 1 Ω
      M10-26 (MSWE) - Body ground	Below 1 Ω
      M6-5 (E) - Body ground	Below 1 Ω

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK
REPLACE OUTER MIRROR CONTROL ECU (FRONT PASSENGER SIDE)