Toyota 4Runner: Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Navigation / Multi Info Display / Navigation System / Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter

DESCRIPTION

The stereo component amplifier assembly receives a vehicle speed signal from the combination meter assembly to control the ASL function.

HINT:

A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls the respective systems based on the pulse signal.
If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.

WIRING DIAGRAM

PROCEDURE

1.	INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

GO TO METER / GAUGE SYSTEM

2.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - COMBINATION METER ASSEMBLY)

(a) Disconnect the N11 stereo component amplifier assembly connector.

(b) Disconnect the F14 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N11-11 (SPD) - F14-28 (+S)	Always	Below 1 Ω
N11-11 (SPD) - Body ground	Always	10 kΩ or higher

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

3.	CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - NO. 4 JUNCTION BLOCK)

(a) Disconnect the N11 stereo component amplifier assembly connector.

(b) Disconnect the A4 No. 4 junction block connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
N11-11 (SPD) - 4A-90	Always	Below 1 Ω
N11-11 (SPD) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 4 JUNCTION BLOCK)

REPAIR OR REPLACE HARNESS OR CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - NO. 4 JUNCTION BLOCK)

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