Section 445 (Power Mirror Control System (W/ Memory) - Diagnostics): Pre-Check

1. Description
   1. Data of the system can be read in the Data Link Connector 3 (DLC3) of the vehicle.

      Therefore, when the system seems to be malfunctioning, use the hand-held tester to check for a malfunction and repair it.

2. Inspect the DLC3.

   The vehicle's ECM uses ISO 9141-2 communication protocol. The terminal arrangement of the DLC3 complies with the SAE J1962 and matches the ISO 9141-2 format.

   Fig 1: Identifying DLC3 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   DLC3 CONNECTOR TERMINALS VOLTAGE AND RESISTANCE SPECIFICATIONS
   
   

   Tester Connection	Condition	Specified Condition
   7 (Bus + line) - 5 (Signal ground)	During communication	Pulse generation
   4 (Chassis ground) - Body ground	Always	Below 1 Ω
   5 (Signal ground) - Body ground	Always	Below 1 Ω
   16 (B+) - Body ground	Always	10 to 14 V

   HINT:

   If the screen displays UNABLE TO CONNECT TO VEHICLE after you have connected the cable of the hand-held tester to the DLC3, turned the ignition switch ON and used the hand-held tester, the problem may be on the vehicle side or the tester side.

   • If communication is normal when the tester is connected to other vehicle, inspect the DLC3 of the original vehicle.
   • If communication is still impossible when the tester is connected to another vehicle, the problem may be in the tester itself, so consult the Service Department listed in the tester's instruction manual.

HINT:

Using the DATA LIST displayed on the hand-held tester, you can read the value of the switch, sensor, actuator, etc. without parts removal. Reading the DATA LIST as the first step of troubleshooting is one way to shorten the labor time.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Read the DATA LIST according to the display on the tester.

   Standard: 

   Outer mirror control ECU assy 

   OUTER MIRROR CONTROL ECU ASSY DATA LIST REFERENCE
   
   

   Item	Measurement Item/Display (Range)	Normal Condition
   MIRR POS SEN V	Vertical mirror position/MIN:0, MAX: 5 V	Within range from 0 to 5 V
   MIRR POS SEN H	Horizontal mirror position/MIN: 0, MAX: 5 V	Within range from 0 to 5 V
   MIRROR MEM 1	Mirror position is memorized in memory switch M1/NOT MEM or MEM	MEM: Memorized NOT MEM: Not memorized
   MIRROR MEN 2	Mirror position is memorized in memory switch M2/NOT MEM or MEM	MEM: Memorized NOT MEM: Not memorized

   Power window regulator master switch assy 

   POWER WINDOW REGULATOR MASTER SWITCH ASSY DATA LIST REFERENCE
   
   

   Item	Measurement Item/Display (Range)	Normal Condition
   SEAT SET SW	Seat memory set switch signal/ON or OFF	ON: Memory set switch is pressed
   SEAT SET SW	Seat memory set switch signal/ON or OFF	OFF: Memory set switch is not pressed
   SEAT MEM M1	Seat memory switch M1 signal/ON or OFF	ON: Seat memory M1 switch is pressed
   SEAT MEM M1	Seat memory switch M1 signal/ON or OFF	OFF: Seat memory M1 switch is not pressed
   SEAT MEM M2	Seat memory switch M2 signal/ON or OFF	ON: Seat memory M2 switch is pressed
   SEAT MEM M2	Seat memory switch M2 signal/ON or OFF	OFF: Seat memory M2 switch is not pressed

   Position control ECU & switch assy 

   POSITION CONTROL ECU & SWITCH ASSY DATA LIST REFERENCE
   
   

   Item	Measurement Item/Display (Range)	Normal Condition
   POWER VOLTAGE	Power supply for position control ECU & switch/MIN: 0 V, MAX: 19.89 V	Within range from 11 to 14 V
   IG SW	Ignition switch status/ON or OFF	ON: Ignition switch is ON
   IG SW	Ignition switch status/ON or OFF	OFF: Ignition switch is OFF
   KEY UNLOCK SW	Key unlock warning switch signal/ON or OFF	ON: Key is in ignition key cylinder
   KEY UNLOCK SW	Key unlock warning switch signal/ON or OFF	OFF: Key is not in ignition key cylinder
   PNP SW	Park/neutral position switch signal/ON or OFF	ON: Shift in P position
   PNP SW	Park/neutral position switch signal/ON or OFF	OFF: Shift in any position except neutral
   M1 SW	Seat memory switch M1 signal/ON or OFF	ON: Seat memory switch M1 is ON
   M1 SW	Seat memory switch M1 signal/ON or OFF	OFF: Seat memory switch M1 is OFF
   M2 SW	Seat memory switch M2 signal/ON or OFF	ON: Seat memory switch M2 is ON
   M2 SW	Seat memory switch M2 signal/ON or OFF	OFF: Seat memory switch M2 is OFF
   SET SW	Seat memory set switch signal/ON or OFF	ON: Memory set switch is ON
   SET SW	Seat memory set switch signal/ON or OFF ON: Memory set switch is ON	OFF: Memory set switch is OFF
   MEM M1 SW	Driving position memorized in seat memory switch M1/NOT MEM or MEM	MEM: Memorized NOT MEM: Not memorized
   MEM M2 SW	Driving position memorized in seat memory switch M2/NOT MEM or MEM	MEM: Memorized NOT MEM: Not memorized
   D-MIRR MEM1	Driver side mirror position memorized in seat memory switch M1/NOT MEM or MEM	MEM: Memorized NOT MEM: Not memorized
   D-MIRR MEM2	Driver side mirror position memorized in seat memory switch M2/NOT MEM or MEM	MEM: Memorized NOT MEM: Not memorized
   P-MIRR MEM M1	Passenger side mirror position memorized in seat memory switch M1/NOT MEM or MEM	MEM: Memorized NOT MEM: Not memorized
   P-MIRR MEM M2	Passenger side mirror position memorized in seat memory switch M2/NOT MEM or MEM	MEM: Memorized NOT MEM: Not memorized
   D-MIRR MEM POS 1	Driver side mirror position memorized in seat memory switch M1/MIN: 0, MAX: 65535	Within range from 0 to 65535

   POSITION CONTROL ECU & SWITCH ASSY DATA LIST REFERENCE
   
   

   Item	Measurement Item/Display (Range)	Normal Condition
   P-MIRR MEM POS 1	Passenger side mirror position memorized in seat memory switch M1/MIN: 0, MAX: 65535	Within range from 0 to 65535
   D-MIRR MEM POS 2	Driver side mirror position memorized in seat memory switch M2/MIN: 0, MAX: 65535	Within range from 0 to 65535
   P-MIRR MEM POS 2	Passenger side mirror position memorized in seat memory switch M2/MIN: 0, MAX: 65535	Within range from 0 to 65535

   Multiplex Network body ECU 

   MULTIPLEX NETWORK BODY ECU DATA LIST REFERENCE
   
   

   Item	Measurement Item/Display (Range)	Normal Condition
   MIRR SEL SWITCH R	Mirror selection switch signal for RH mirror/ON or OFF	ON: Switch is in Right position
   MIRR SEL SWITCH R	Mirror selection switch signal for RH mirror/ON or OFF	OFF: Switch is in original or Left position
   MIRR SEL SWITCH L	Mirror selection switch signal for LH mirror/ON or OFF	ON: Switch is in Left position
   MIRR SEL SWITCH L	Mirror selection switch signal for LH mirror/ON or OFF	OFF: Switch is in original or Right position
   MIRR POS SWITCH R	Mirror position switch signal (Right)/ON or OFF	ON: Switch R is ON
   MIRR POS SWITCH R	Mirror position switch signal (Right)/ON or OFF	OFF: Any switch except R is ON or all switches are OFF
   MIRR POS SWITCH L	Mirror position switch signal (Left)/ON or OFF	ON: Switch L is ON
   MIRR POS SWITCH L	Mirror position switch signal (Left)/ON or OFF	OFF: Any switch except L is ON or all switches are OFF
   MIRR POS SWITCH UP	Mirror position switch signal (Up)/ON or OFF	ON: Switch UP is ON
   MIRR POS SWITCH UP	Mirror position switch signal (Up)/ON or OFF	OFF: Any switch except UP is ON or all switches are OFF
   MIRR POS SWITCH DOWN	Mirror position switch signal (Down)/ON or OFF	ON: Switch DOWN is ON
   MIRR POS SWITCH DOWN	Mirror position switch signal (Down)/ON or OFF	OFF: Any switch except DOWN is ON or all switches are OFF

HINT:

Performing the ACTIVE TEST using the hand-held tester allows you to operate the relay, VSV, actuator, etc. without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one way to shorten the labor time.

It is possible to display the DATA LIST during the ACTIVE TEST.

1. Connect the hand-held tester to the DLC3.
2. Turn the ignition switch ON.
3. Perform the ACTIVE TEST according to the display on the tester.

   Standard (Outer mirror control ECU): 

   ACTIVE TEST REFERENCE
   
   

   Item	Test Details
   MIRR UP/DOWN	Mirror vertical operation UP/DOWN
   MIRR RIGHT/LEFT	Mirror horizontal operation RIGHT/LEFT
   MIRR HEATER	Mirror heater operation OFF/ON