Toyota 4Runner: LVDS Signal Malfunction (from Extension Module) (B1532)

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / LVDS Signal Malfunction (from Extension Module) (B1532)

DESCRIPTION

DTC No.	DTC Detection Condition	Trouble Area
B1532	When one of the conditions below is met: Stereo component tuner assembly is/was not connected while the ignition switch is/was ACC or ON. Communication between the navigation receiver assembly and the stereo component tuner assembly is/was not possible when the engine is/was started.	Stereo component tuner assembly power source circuit LVDS circuit between navigation receiver assembly and stereo component tuner assembly Stereo component tuner assembly Navigation receiver assembly Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After replacing the navigation receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, registration of the XM radio ID is necessary.

PROCEDURE

CHECK DTC

(a) Clear the DTCs (See page ).

(b) Recheck for DTCs and check if the same DTC are output again.

OK:

No DTCs are output.

USE SIMULATION METHOD TO CHECK

2.	CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER ASSEMBLY - STEREO COMPONENT TUNER ASSEMBLY)

(a) Disconnect the s1 and t1 navigation receiver assembly connectors.

(b) Disconnect the s2 and t2 stereo component tuner assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
s1-1 (USV4) - s2-1 (USV4)	Always	Below 1 Ω
s1-2 (US4-) - s2-2 (US4-)	Always	Below 1 Ω
s1-3 (US4+) - s2-3 (US4+)	Always	Below 1 Ω
s1-4 (UGD4) - s2-4 (UGD4)	Always	Below 1 Ω
s1-5 (USG4) - s2-5 (USG4)	Always	Below 1 Ω
t1-4 (+B2) - t2-4 (+B2)	Always	Below 1 Ω
t1-3 (ACC2) - t2-3 (ACC2)	Always	Below 1 Ω
t1-8 (GND2) - t2-8 (GND2)	Always	Below 1 Ω
s1-1 (USV4) - Body ground	Always	10 kΩ or higher
s1-2 (US4-) - Body ground	Always	10 kΩ or higher
s1-3 (US4+) - Body ground	Always	10 kΩ or higher
s1-4 (UGD4) - Body ground	Always	10 kΩ or higher
s1-5 (USG4) - Body ground	Always	10 kΩ or higher
t1-4 (+B2) - Body ground	Always	10 kΩ or higher
t1-3 (ACC2) - Body ground	Always	10 kΩ or higher
t1-8 (GND2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS AND CONNECTOR

3.	REPLACE HARNESS AND CONNECTOR (LVDS COMMUNICATION LINE)

(a) Replace the harness and connector (LVDS communication line).

(b) Clear the DTCs (See page ).

OK:

No DTCs are output.

END

4.	REPLACE STEREO COMPONENT TUNER ASSEMBLY

(a) Replace the stereo component tuner assembly (See page ).

(b) Clear the DTCs (See page ).

OK:

No DTCs are output.

END

REPLACE NAVIGATION RECEIVER ASSEMBLY

Diagnostic Trouble Code Chart

DIAGNOSTIC TROUBLE CODE CHART Navigation System DTC Code Detection Item See page B1532 LVDS Signal Malfunction (from Extension Module) ...

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