Toyota CH-R Service Manual: Reverse Signal Circuit

Toyota CH-R Service Manual / Navigation / Multi Info Display / Navigation System / Reverse Signal Circuit

DESCRIPTION

The radio and display receiver assembly receives a reverse signal from the park/neutral position switch.

WIRING DIAGRAM

PROCEDURE

1.

CHECK VEHICLE SIGNAL (OPERATION CHECK)

(a) Enter the "Vehicle Signal Check Mode" screen. [Refer to Check Vehicle Signal in Operation Check (Click here ).

(b) Check that the display changes between ON and OFF according to the shift lever position.

HINT:

This display is updated once per second. As a result, it is normal for the display to lag behind the actual shift lever position.

OK:

Shift Lever Position

Display

R

ON

Except R

OFF
ON

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

OFF

2.

CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

(a) Disconnect the radio and display receiver assembly connector.

*a

Front view of wire harness connector

(to Radio and Display Receiver Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F129-28 (REV) - Body ground

Engine switch on (IG), shift lever in R

7.5 to 14 V

F129-28 (REV) - Body ground

Engine switch on (IG), shift lever not in R

Below 1 V
OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

3.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - PARK/NEUTRAL POSITION SWITCH)

(a) Disconnect the F129 radio and display receiver assembly connector.

(b) Disconnect the C36 park/neutral position switch connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F129-28 (REV) - C36-2 (RL)

Always

Below 1 Ω

F129-28 (REV) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - PARK/NEUTRAL POSITION SWITCH)

(a) Disconnect the park/neutral position switch connector.

*a

Front view of wire harness connector

(to Park/neutral Position Switch)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

C36-1 (RB) - Body ground

Engine switch on (IG)

11 to 14 V
OK

REPLACE PARK/NEUTRAL POSITION SWITCH

NG

REPAIR OR REPLACE HARNESS AND CONNECTOR
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