DESCRIPTION
The radio receiver assembly and map light assembly (telephone microphone assembly) are connected to each other using the microphone connection detection signal lines.
Using this circuit, the radio receiver assembly sends power to the map light assembly (telephone microphone assembly), and the map light assembly (telephone microphone assembly) sends microphone signals to the radio receiver assembly.
WIRING DIAGRAM
PROCEDURE
1. |
CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY - MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY)) |
(a) Disconnect the F47 radio receiver assembly connector.
(b) Disconnect the R2 map light assembly (telephone microphone assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F47-6 (SNS2) - R2-1 (SNS2) |
Always |
Below 1 Ω |
F47-4 (MACC) - R2-9 (MACC) |
Always |
Below 1 Ω |
F47-5 (MIN+) - R2-8 (MCO+) |
Always |
Below 1 Ω |
F47-19 (MIN-) - R2-7 (MCO-) |
Always |
Below 1 Ω |
F47-6 (SNS2) or R2-1 (SNS2) - Body ground |
Always |
10 kΩ or higher |
F47-4 (MACC) or R2-9 (MACC) - Body ground |
Always |
10 kΩ or higher |
F47-5 (MIN+) or R2-8 (MCO+) - Body ground |
Always |
10 kΩ or higher |
F47-19 (MIN-) or R2-7 (MCO-) - Body ground |
Always |
10 kΩ or higher |
F47-18 (SGND) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
2. |
INSPECT RADIO RECEIVER ASSEMBLY |
(a) Connect the F47 radio receiver assembly connector.
(b) Connect the R2 map light assembly (telephone microphone assembly) connector.
(c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F47-18 (SGND) - Body ground |
Always |
Below 1 Ω |
F47-19 (MIN-) - Body ground |
Always |
Below 1 Ω |
NG | ![]() |
REPLACE RADIO RECEIVER ASSEMBLY |
|
3. |
INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) |
(a) Remove the map light assembly (telephone microphone assembly).
Click here
(b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG | ![]() |
REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) |
|
4. |
INSPECT MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) |
(a) Connect the R2 map light assembly (telephone microphone assembly) connector.
(b) Turn the ignition switch to ACC.
(c) Connect an oscilloscope to terminals 8 (MCO+) and 7 (MCO-) of the R2 map light assembly (telephone microphone assembly) connector. |
|
(d) Check the waveform of the map light assembly (telephone microphone assembly) using the oscilloscope.
Result |
Proceed to |
---|---|
A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is output. |
A |
A waveform synchronized with the voice input to the map light assembly (telephone microphone assembly) is not output. |
B |
A | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
B | ![]() |
REPLACE MAP LIGHT ASSEMBLY (TELEPHONE MICROPHONE ASSEMBLY) |
Toyota CH-R Service Manual > Pre-collision System: Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Pre-collision System
DTC No.
Detection Item
Link
C1A02
Vehicle Information Not Obtained
C1A10
Front Radar Sensor
C1A11
Front ...
Toyota CH-R Service Manual > Window Defogger System: Rear Window Defogger System does not Operate
DESCRIPTION
When the rear window defogger switch on the air conditioning control assembly
is pressed, the operation signal is transmitted to the air conditioning amplifier
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