Reverse Signal Circuit: Procedure

Fig 1: Diagnosis Display - Vehicle Signal Check Mode Screen

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Enter the "Display Check" mode and select "Vehicle Signal Check Mode". Refer to OPERATION CHECK .
2. Check that the display changes between ON and OFF according to the shift lever operation.

   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   2 

OK → See step   4 

Fig 2: Identifying F28 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the F28 display connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F28-13 (REV) - Body ground	Engine switch on (IG), shift lever in R	11 to 14 V
   F28-13 (REV) - Body ground	Engine switch on (IG), shift lever not in R	Below 1 V

NG → See step   3 

OK → See step   5 

Fig 3: Identifying F28 And C19 Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the F28 display connector.
2. Disconnect the C19 position switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F28-13 (REV) - C19-1	Always	Below 1 Ω
   F28-13 (REV) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE PARK/NEUTRAL POSITION SWITCH