Reverse Signal Circuit: Procedure

1. Move the shift lever to R and check if the back-up light comes on.

   OK

   The back-up light comes on.

NG → See step   6 

OK: Go to next step 

1. Enter the "Display Check" mode (Vehicle Signal Check Mode). Refer to SYSTEM DESCRIPTION .
   Fig 1: Display -- Vehicle Signal Check Mode

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2. Check that the display changes between ON and OFF according to the shift lever operation (P and R).

   OK

   Shift Lever Position	Display
   R	ON
   Except R	OFF

   HINT: 

   This display is updated once per second. As a result, it is normal for the display to lag behind the actual change in the switch.

NG → See step   3 

OK → See step   7 

1. Disconnect the J50 connector from the multi-display.
   Fig 2: Identifying Terminals Of Multi-Display Connector

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J50-13 (REV) - Body ground	Engine switch is on (IG). Shift lever is in R.	11 to 14 V
   J50-13 (REV) - Body ground	Engine switch is on (IG). Shift lever is in any position except R.	Below 1 V

NG → See step   4 

OK → See step   8 

1. Disconnect the Q2 connector from the main body ECU LH (cowl side junction block LH).
   Fig 3: Identifying Terminals Of Multi-Display Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.
   Fig 4: Identifying Q2 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J50-13 (REV) - Q2-2 (BACK)	Always	Below 1 Ω
   J50-13 (REV) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the LJ connector from the main body ECU LH (cowl side junction block LH).
   Fig 5: Identifying LJ Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   LJ-23 (BKUP) - Body ground	Engine switch is on (IG). Shift lever is in R.	11 to 14 V
   LJ-23 (BKUP) - Body ground	Engine switch is on (IG). Shift lever is in any position except R.	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU LH