Toyota 4Runner: Reverse Signal Circuit

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Audio / Video / Audio And Visual System / Reverse Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (REVERSE SIGNAL)

(a) Disconnect the G49 radio and display receiver assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
G49-2 (REV) - Body ground	Ignition switch ON Shift lever in R	11 to 14 V
G49-2 (REV) - Body ground	Ignition switch ON Shift lever in any position other than R	Below 1 V

Tester Connection

Switch Condition

Specified Condition

G49-2 (REV) - Body ground

Ignition switch ON

Shift lever in R

11 to 14 V

G49-2 (REV) - Body ground

Ignition switch ON

Shift lever in any position other than R

Below 1 V

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

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

(a) Disconnect the G49 radio and display receiver assembly connector.

(b) Disconnect the B42 park/neutral position switch assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
G49-2 (REV) - B42-1 (RL)	Always	Below 1 Ω
G49-2 (REV) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (PARK/NEUTRAL POSITION SWITCH ASSEMBLY - BATTERY)

(a) Disconnect the B42 park/neutral position switch assembly connector.

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
B42-2 (RB) - Body ground	Ignition switch ON	11 to 14 V

Text in Illustration

*a	Front view of wire harness connector (to Park/Neutral Position Switch Assembly)

Result	Proceed to
NG	A
OK (for A750E)	B
OK (for A750F)	C

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE PARK/NEUTRAL POSITION SWITCH ASSEMBLY

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