RX400h · Service Manual BODY

Driving Position Memory Switch Circuit (w/ Memory)

Circuit diagnosis

DESCRIPTION

The seat memory switch sends signals to the power window regulator switch assembly (power window master switch) 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 seat memory switch is later used to send signals to the front power seat switch to return the seat to one of the memorized positions.
The power seat memory operation can be performed only when the ignition switch is on and the shift lever is in the P position.

WIRING DIAGRAM

B111873E01

INSPECTION PROCEDURE


1. READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on.

  1. Read the DATA LIST.

    D_SEAT (Position control ECU and switch assembly) 
    Item
    		 Measurement Item/Range (Display)
    		 Normal Condition
    		 Diagnostic Note
    M2 Switch
    		 Seat memory M2 switch signal/ ON or OFF
    		 ON: Seat memory M2 switch is ON
    OFF: Seat memory M2 switch is OFF
    		 -
    M1 Switch
    		 Seat memory M1 switch signal/ ON or OFF
    		 ON: Seat memory M1 switch is ON
    OFF: Seat memory M1 switch is OFF
    		 -
    SET Switch
    		 Seat memory set switch signal/ ON or OFF
    		 ON: Seat memory set switch is ON
    OFF: Seat memory set switch is OFF
    		 -

    OK:
    Condition status can be displayed.



 NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT SEAT MEMORY SWITCH (DRIVING POSITION MEMORY SWITCH)

  1. Remove the seat memory switch.

  1. B068340E01
    Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester Connection
    		 Switch Position
    		 Specified Condition
    1(E) - 2(MMRY)
    		 SET switch ON (pushed)
    		 Below 1 Ω
    1(E) - 2(MMRY)
    		 SET switch OFF (not pushed)
    		 10 kΩ or higher
    1(E) - 4(1)
    		 SW1 switch ON (pushed)
    		 Below 1 Ω
    1(E) - 4(1)
    		 SW1 switch OFF (not pushed)
    		 10 kΩ or higher
    1(E) - 3(2)
    		 SW2 switch ON (pushed)
    		 Below 1 Ω
    1(E) - 3(2)
    		 SW2 switch OFF (not pushed)
    		 10 kΩ or higher



NG
REPLACE SEAT MEMORY SWITCH (DRIVING POSITION MEMORY SWITCH)
OK


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

  1. B111886E03
    Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester Connection
    		 Switch Position
    		 Specified Condition
    D16-2(MMRY) - D16-1(E)
    		 Ignition switch on
    		 10 to 14 V
    D16-3(2) - D16-1(E)
    		 Ignition switch on
    		 10 to 14 V
    D16-4(1) - D16-1(E)
    		 Ignition switch on
    		 10 to 14 V



NG
Go to step 4
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4. CHECK HARNESS AND CONNECTOR (POWER WINDOW REGULATOR SWITCH ASSEMBLY - SEAT MEMORY SWITCH)

  1. B111885E02
    Disconnect the power window regulator switch assembly connector.

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

    Resistance:
    Tester Connection
    		 Switch Position
    		 Specified Condition
    D16-1(E) - Body ground
    		 Always
    		 Below 1 Ω
    D16-2(MMRY) - P19-3(MM)
    		 Always
    		 Below 1 Ω
    D16-3(2) - P19-17(M2)
    		 Always
    		 Below 1 Ω
    D16-4(1) - P19-13(M1)
    		 Always
    		 Below 1 Ω
    D16-2(MMRY) - Body ground
    		 Always
    		 10 kΩ or higher
    D16-3(2) - Body ground
    		 Always
    		 10 kΩ or higher
    D16-4(1) - Body ground
    		 Always
    		 10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER WINDOW REGULATOR SWITCH ASSEMBLY (POWER WINDOW MASTER SWITCH)


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