DESCRIPTION
The stereo component amplifier assembly receives a vehicle speed signal from the combination meter assembly to control the ASL function.
HINT:
WIRING DIAGRAM
1. for 1AR-FE
2. for 2GR-FE
PROCEDURE
1. |
INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) |
(a) Check the output waveform. (1) Remove the combination meter assembly with the connector(s) still connected. (2) Connect an oscilloscope to terminal E1-16 (+S) and body ground. (3) Turn the ignition switch to ON. (4) Turn a wheel slowly. (5) Check the signal waveform according to the condition(s) in the table below.
OK: The waveform is similar to that shown in the illustration. HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. Text in Illustration
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NG | ![]() |
GO TO METER / GAUGE SYSTEM |
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2. |
INSPECT STEREO COMPONENT AMPLIFIER ASSEMBLY (INPUT WAVEFORM) |
(a) Check the input waveform. (1) Remove the stereo component amplifier assembly with the connector(s) still connected. (2) Connect an oscilloscope to terminal E14-11 (SPD) and body ground. (3) Turn the ignition switch to ON. (4) Turn a wheel slowly. (5) Check the signal waveform according to the condition(s) in the table below.
OK: The waveform is similar to that shown in the illustration. HINT: When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows. Text in Illustration
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OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
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3. |
CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - JUNCTION CONNECTOR) |
(a) Disconnect the E14 stereo component amplifier assembly connector.
(b) Disconnect the E31 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
E14-11 (SPD) - E31-21 |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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4. |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - JUNCTION CONNECTOR) |
(a) Disconnect the E1 combination meter assembly connector.
(b) Disconnect the E31 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
E1-16 (+S) - E31-19 |
Always |
Below 1 Ω |
OK | ![]() |
REPLACE JUNCTION CONNECTOR |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Precaution
PRECAUTION
1. PRECAUTION FOR VEHICLE WITH SRS AIRBAG AND SEAT BELT PRETENSIONER
(a) Some operations in this section may affect the SRS airbags. Prior to performing
the corresponding operations, read the precautions regarding the SRS airbags (See
page ). ...
Indicators and warning lights
The indicator and warning lights on the instrument cluster and center panel
inform the driver of the status of the vehicle’s various systems.
For the purpose of explanation, the following illustration displays all indicators
and warning lights illuminat ...
No Answer-Back
DESCRIPTION
In some cases, wireless door lock control functions are normal but the hazard
warning light and/or wireless door lock buzzer answer-back function(s) does not
operate. In such cases, the main body ECU (driver side junction block assembly)
haz ...