Driving Position Memory Switch Circuit (w/ Memory): Procedure

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

READ VALUE USING TECHSTREAM

Connect Techstream to the DLC3.
Turn the ignition switch on (IG).

Read the DATA LIST.

DRIVER SEAT:

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic note
M2 Switch	Seat memory switch M2 signal/ ON or OFF	ON: Seat memory switch M2 is ON OFF: Seat memory switch M2 is OFF	-
M1 Switch	Seat memory switch M1 signal/ ON or OFF	ON: Seat memory switch M1 is ON OFF: Seat memory switch M1 is OFF	-
SET Switch	Seat memory set switch signal/ ON or OFF	ON: Memory set switch is ON OFF: Memory set switch is OFF	-

Condition status can be displayed.

NG → See step 2

OK → PROCEED TO PROBLEM SYMPTOMS TABLE NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

INSPECT SEAT MEMORY SWITCH

Remove the seat memory switch.

Fig 1: Identifying Seat Memory Switch Connector Terminal Identification
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Resistance

Tester Connection	Condition	Specified Condition
1 (M1) - 4 (E)	SW1 switch pushed	Below 1 Ω
2 (M2) - 4 (E)	SW2 switch pushed	Below 1 Ω
3 (MRY) - 4 (E)	SET switch pushed	Below 1 Ω

NG → REPLACE SEAT MEMORY SWITCH

OK: Go to next step

CHECK HARNESS AND CONNECTOR (SEAT MEMORY SWITCH CIRCUIT)

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

Fig 2: Identifying Harness And Connector (Seat Memory Switch Circuit) Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Voltage

Tester Connection	Condition	Specified Condition
H7-1 (M1) - H7-4 (E)	Ignition switch on (IG)	10 to 14 V
H7-2 (M2) - H7-4 (E)	Ignition switch on (IG)	10 to 14 V
H7-3 (MRY) - H7-4 (E)	Ignition switch on (IG)	10 to 14 V

NG → See step 4

OK → PROCEED TO PROBLEM SYMPTOMS TABLE NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

CHECK HARNESS AND CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY - SEAT MEMORY SWITCH)

Disconnect the H1 connector from the door ECU.

Fig 3: Identifying H1 Connector From Door ECU Connector End View
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Resistance

Tester Connection	Condition	Specified Condition
H7-1 (M1) - H1-22 (M1)	Always	Below 1 Ω
H7-2 (M2) - H1-23 (M2)	Always	Below 1 Ω
H7-3 (MRY) - H1-25 (MM)	Always	Below 1 Ω
H7-4 (E) - Body ground	Always	Below 1 Ω
H7-1 (M1) - Body ground	Always	10 kΩ or higher
H7-2 (M2) - Body ground	Always	10 kΩ or higher
H7-3 (MRY) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY