DESCRIPTION
The navigation ECU receives a vehicle speed signal from the combination meter assembly.
HINT:
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
CHECK 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 F4-6 (+S) and body ground. (3) Turn the engine switch on (IG). (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. |
|
NG |
GO TO METER / GAUGE SYSTEM |
|
2. |
CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - COMBINATION METER ASSEMBLY) |
(a) Disconnect the F135 navigation ECU connector.
(b) Disconnect the F4 combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F135-9 (SPD) - F4-6 (+S) |
Always |
Below 1 Ω |
OK |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Toyota CH-R Service Manual > Audio And Visual System(for Radio And Display Type): Black Screen
PROCEDURE
1.
CHECK DISPLAY SETTING
(a) Check that the display is not in screen off mode.
OK:
The display setting is not in screen off mode.
NG
CHANGE SCREEN TO SCREEN ON MODE
OK
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Toyota CH-R Service Manual > Air Conditioning System(for Automatic Air Conditioning System With Top-mounted
Air Conditioner Pressure Sensor): Back-up Power Source Circuit
DESCRIPTION
The back-up power source circuit for the air conditioning amplifier assembly
is shown below. Power is supplied even when the ignition switch is off. This power
is used for diagnostic trouble code memory, etc.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for ...