Toyota Tacoma (2015-2018) Service Manual: LVDS Signal Malfunction (from Extension Module) (B1532,B156C)

Toyota Tacoma (2015-2018) Service Manual / Navigation / Multi Info Display / Navigation System / LVDS Signal Malfunction (from Extension Module) (B1532,B156C)

DESCRIPTION

DTC Code	DTC Detection Condition	Trouble Area
B1532	When one of the conditions below is met: Video signal (digital) is lost. The stereo component tuner assembly is not connected while the ignition switch is ON or ACC. Communication between the navigation receiver assembly and the stereo component tuner assembly is not possible when the engine is started.	Stereo component tuner assembly Navigation receiver assembly Harness or connector No. 1 navigation wire
B156C

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

After replacing the stereo component tuner assembly of vehicles subscribed to pay-type satellite radio broadcasts, XM radio ID registration is necessary. (w/ SDARS System)

PROCEDURE

CHECK DTC

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page OK: ).

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 N19, N27 and N28 navigation receiver assembly connectors.

(b) Disconnect the S52, S53 and S54 stereo component tuner assembly connectors.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N27-1 (USV4) - S53-1 (USV4)	Always	Below 1 Ω
N27-2 (US4-) - S53-2 (US4-)	Always	Below 1 Ω
N27-3 (US4+) - S53-3 (US4+)	Always	Below 1 Ω
N27-4 (UGO4) - S53-4 (UGO4)	Always	Below 1 Ω
N27-5 (USG4) - S53-5 (USG4)	Always	Below 1 Ω
N19-4 (+B2) - S52-4 (+B)	Always	Below 1 Ω
N19-3 (ACC2) - S52-3 (ACC2)	Always	Below 1 Ω
N19-8 (GND2) - S52-8 (GND2)	Always	Below 1 Ω
N28-1 (LVDS) - S54-1 (LVDS)	Always	Below 1 Ω
N27-1 (USV4) - Body ground	Always	10 kΩ or higher
N27-2 (US4-) - Body ground	Always	10 kΩ or higher
N27-3 (US4+) - Body ground	Always	10 kΩ or higher
N27-4 (UGO4) - Body ground	Always	10 kΩ or higher
N27-5 (USG4) - Body ground	Always	10 kΩ or higher
N19-4 (+B2) - Body ground	Always	10 kΩ or higher
N19-3 (ACC2) - Body ground	Always	10 kΩ or higher
N19-8 (GND2) - Body ground	Always	10 kΩ or higher
N28-1 (LVDS) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK NO. 1 NAVIGATION WIRE

(a) Replace the No. 1 navigation wire with a known good one (See page (b) Clear the DTCs (See page ). ).

(b) Clear the DTCs (See page (c) Check for DTCs (See page ). ).

OK:

No DTCs are output.

END (NO. 1 NAVIGATION WIRE WAS DEFECTIVE)

4.	CHECK STEREO COMPONENT TUNER ASSEMBLY

(a) Replace the stereo component tuner assembly with a known good one (See page (b) Clear the DTCs (See page ). ).

(b) Clear the DTCs (See page (c) Check for DTCs (See page ). ).

OK:

No DTCs are output.

END (STEREO COMPONENT TUNER ASSEMBLY IS DEFECTIVE)

REPLACE NAVIGATION RECEIVER ASSEMBLY

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