Toyota 4Runner manuals

Toyota 4Runner: 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

1.

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.


OK

USE SIMULATION METHOD TO CHECK

NG

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.

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

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


NG

REPAIR OR REPLACE HARNESS AND CONNECTOR

OK

3.

REPLACE HARNESS AND CONNECTOR (LVDS COMMUNICATION LINE)

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

(b) Clear the DTCs (See page ).


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

OK:

No DTCs are output.


OK

END

NG

4.

REPLACE STEREO COMPONENT TUNER ASSEMBLY

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


(b) Clear the DTCs (See page ).


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

OK:

No DTCs are output.


OK

END


NG

REPLACE NAVIGATION RECEIVER ASSEMBLY

Diagnostic Trouble Code Chart
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