Toyota Tundra Service Manual: LVDS Signal Malfunction (from Extension Module) (B1532,B156C)

Toyota Tundra Service Manual / Audio, Visual, Telematics / Navigation / Multi Info Display / Navigation System / LVDS Signal Malfunction (from Extension Module) (B1532,B156C)

DESCRIPTION

DTC Code

DTC Detection Condition

Trouble Area

B1532

When either condition 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.

No. 1 navigation wire
Stereo component tuner assembly
Navigation receiver assembly
Harness or connector

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.

PROCEDURE

1.	CHECK FOR DTC

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

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 K1 and L1 navigation receiver assembly connectors.

(b) Disconnect the K2 and L3 stereo component tuner assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
K1-1 (USV4) - K2-1 (USV4)	Always	Below 1 Ω
K1-2 (US4-) - K2-2 (US4-)	Always	Below 1 Ω
K1-3 (US4+) - K2-3 (US4+)	Always	Below 1 Ω
K1-4 (UGD4) - K2-4 (UGD4)	Always	Below 1 Ω
K1-5 (USG4) - K2-5 (USG4)	Always	Below 1 Ω
L1-4 (+B2) - L3-4 (+B)	Always	Below 1 Ω
L1-3 (ACC2) - L3-3 (ACC2)	Always	Below 1 Ω
L1-8 (GND2) - L3-8 (GND2)	Always	Below 1 Ω
K1-1 (USV4) - Body ground	Always	10 kΩ or higher
K1-2 (US4-) - Body ground	Always	10 kΩ or higher
K1-3 (US4+) - Body ground	Always	10 kΩ or higher
K1-4 (UGD4) - Body ground	Always	10 kΩ or higher
K1-5 (USG4) - Body ground	Always	10 kΩ or higher
L1-4 (+B2) - Body ground	Always	10 kΩ or higher
L1-3 (ACC2) - Body ground	Always	10 kΩ or higher
L1-8 (GND2) - 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.

for Column Shift Type: See page

for Floor Shift Type: See page

(b) Clear the DTCs (See page ).

OK:

No DTCs are output.

END (NO. 1 NAVIGATION WIRE IS DEFECTIVE)

4.	CHECK STEREO COMPONENT TUNER ASSEMBLY

(a) Replace the stereo component tuner assembly with a known good one.

for Column Shift Type: See page

for Floor Shift Type: See page

(b) Clear the DTCs (See page ).

OK:

No DTCs are output.

Result

Result	Proceed to
OK	A
NG (for Column Shift Type)	B
NG (for Floor Shift Type)	C

END (STEREO COMPONENT TUNER ASSEMBLY IS DEFECTIVE)

REPLACE NAVIGATION RECEIVER ASSEMBLY

Lost Communication with Meter (B1324)

HD Radio Tuner Malfunction (B1551,B15A0,B15AD,B15B0,B15B3,B15B4,B15B7)

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