Toyota Tundra Service Manual: Data Signal Circuit between Navigation Receiver Assembly and Extension Module

Toyota Tundra Service Manual / Audio, Visual, Telematics / Navigation / Multi Info Display / Navigation System / Data Signal Circuit between Navigation Receiver Assembly and Extension Module

DESCRIPTION

The stereo component tuner assembly sends the sound data signal or image data signal from a device to the navigation receiver assembly via this circuit.

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 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 (+B2)	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

2.	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) Check that the malfunction disappears.

OK:

Malfunction disappears.

END (NO. 1 NAVIGATION WIRE IS DEFECTIVE)

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Data List / Active Test

Data Signal Circuit between Navigation Receiver Assembly and Stereo Jack Adapter

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DESCRIPTION When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI relay) and supplying power to terminals + ...

Toyota Tundra Service Manual: Data Signal Circuit between Navigation Receiver Assembly and Extension Module

Data List / Active Test

Data Signal Circuit between Navigation Receiver Assembly and Stereo Jack Adapter

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