DESCRIPTION
When the windshield deicer switch on the air conditioning control assembly is pressed, the operation signal is transmitted to the air conditioning amplifier assembly. via LIN communication. When the air conditioning amplifier assembly receives the signal, it turns on the DEICER relay to operate the windshield deicer system.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
PROCEDURE
1. |
CHECK AIR CONDITIONING SYSTEM |
(a) Check air conditioning system.
HINT:
Both the windshield deicer system operation signal and air conditioning system operation signal are transmitted to the air conditioning amplifier assembly via the same communication line.
OK:
The air conditioning system operates normally.
Result |
Proceed to |
---|---|
OK |
A |
NG (for TMMT Made) |
B |
NG (for TMC Made) |
C |
B | ![]() |
GO TO AIR CONDITIONING SYSTEM |
C | ![]() |
GO TO AIR CONDITIONING SYSTEM |
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM |
(a) Using the Techstream, perform the Active Test.
Click here
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
---|---|---|---|
Deicer Relay (Front) |
Windshield glass (windshield deicer) |
OFF or ON |
- |
Tester Display |
---|
Deicer Relay (Front) |
OK:
The windshield deicer system operates normally.
NG | ![]() |
GO TO STEP 4 |
|
3. |
REPLACE AIR CONDITIONING CONTROL ASSEMBLY |
(a) Replace air conditioning control assembly with a new or known good one.
Click here
(b) Check that the window defogger system operates normally.
Click here
OK | ![]() |
END (AIR CONDITIONING CONTROL ASSEMBLY WAS DEFECTIVE) |
NG | ![]() |
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY |
4. |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BATTERY) |
(a) Disconnect the 3F and 3A instrument panel junction block assembly connectors. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
3F-5 - Body ground |
Always |
11 to 14 V |
3A-21 - Body ground |
Ignition switch ON |
11 to 14 V |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY) |
(a) Disconnect the 3A instrument panel junction block assembly connector.
(b) Disconnect the F72*1 or F139*2 air conditioning amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for TMMT Made
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3A-18 - F72-24 (FDEF) |
Always |
Below 1 Ω |
3A-18 or F72-24 (FDEF) - Body ground |
Always |
10 kΩ or higher |
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3A-18 - F139-17 (FDEF) |
Always |
Below 1 Ω |
3A-18 or F139-17 (FDEF) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
6. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly
Click here
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3F-5 - 3F-4 |
Battery voltage applied between terminals 3A-21 and 3A-18 |
Below 1 Ω |
Battery voltage not applied between terminals 3A-21 and 3A-18 |
10 kΩ or higher |
NG | ![]() |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
|
7. |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY -WINDSHIELD GLASS (WINDSHIELD DEICER)) |
(a) Disconnect the A64 windshield glass (windshield deicer) connector.
(b) Disconnect the 3F instrument panel junction block.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3F-4 - A64-1 (B) |
Always |
Below 1 Ω |
3F-4 or A64-1 (B) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK HARNESS AND CONNECTOR (WINDSHIELD GLASS [WINDSHIELD DEICER] - BODY GROUND) |
(a) Disconnect the windshield glass (windshield deicer) connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A64-2 (E) - Body ground |
Always |
Below 1 Ω |
OK | ![]() |
REPLACE WINDSHIELD GLASS (WINDSHIELD DEICER) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
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ILLUSTRATION
*1
FRONT SEAT CUSHION SHIELD
*2
FRONT SEAT INNER BELT ASSEMBLY
*3
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*4
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