Toyota Tundra (2015 year). Manual — part 973
Last Modified: 9-16-2014
6.6 J
Doc ID: RM0000020S002TX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Vehicle Speed Signal Circuit between Radio Receiver and
Combination Meter; 2015 MY Tundra [08/2014 - ]
Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter
DESCRIPTION
Audio function:
This circuit is necessary for the automatic sound levelizer (ASL) built into the radio and display receiver assembly.
ASL function:
Speed signals are received from the combination meter assembly and used for the ASL.
The ASL function automatically adjusts the sound volume in order to maintain clear audio sound even when
vehicle noise increases (as vehicle noise increases, the volume is turned up, etc.).
HINT:
INSPECTION PROCEDURE
PROCEDURE
1.
CHECK VEHICLE SIGNAL
AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Vehicle Speed S...
OK
(a) Enter the "Vehicle Signal Check Mode" screen. [Refer to Check
Vehicle Signal Check Mode in Operation Check
]
OK:
Vehicle speed displayed on the "Vehicle Signal Check Mode" screen is almost the same as the reading on
the speedometer.
NG
GO TO STEP 2
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN
PROBLEM SYMPTOMS TABLE
2.
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY -
COMBINATION METER ASSEMBLY)
(a) Disconnect the J139 radio and display receiver assembly connector.
(b) Disconnect the J28 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
J139-17 (SPD) - J28-29 (+S)
Always
Below 1 Ω
J139-17 (SPD) - Body ground
Always
10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
3.
INSPECT COMBINATION METER ASSEMBLY (SPEED SIGNAL)
AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Vehicle Speed S...
(a) Check the input waveform.
(1) Remove the combination meter assembly with the
connector(s) still connected.
(2) Connect an oscilloscope to terminal J28-29 (+S) and body
ground.
(3) Turn the ignition switch to ON.
(4) Check the signal waveform according to the condition(s) in
the table below.
Measurement Condition
ITEM
CONDITION
Terminal No.
(Symbol)
J28-29 (+S) - Body ground
Tool setting
5 V/DIV., 20 ms./DIV.
Condition
Being driven at approximately 20 km/h (12
mph)
OK:
The waveform displayed is as 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
*a
Component with harness connected
(Combination Meter Assembly)
Result
RESULT
PROCEED TO
OK (for Column Shift Type)
A
OK (for Floor Shift Type)
B
NG
C
B
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY
C
GO TO METER / GAUGE SYSTEM
A
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY
AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Vehicle Speed S...
AUDIO / VISUAL: AUDIO AND VISUAL SYSTEM: Vehicle Speed S...
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