Mirror Heater Does Not Operate With Rear Defogger Switch
MIRROR: POWER MIRROR CONTROL SYSTEM: Mirror Heater does not Operate with Rear Defogger Switch
- Mirror Heater does not Operate with Rear Defogger Switch
SYSTEM DESCRIPTION
The mirror heater operates when the following conditions are met: 1) the A/C amplifier sends a rear defogger switch signal through the multiplex communication line to the front multiplex network door ECU LH and RH, and 2) the defogger operates.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK DEFOGGER SYSTEM
(a) Check that the defogger operates normally.
OK:
Defogger operates normally.
NG -- GO TO DEFOGGER SYSTEM
OK -- Continue to next step.
2. PERFORM ACTIVE TEST USING TECHSTREAM (MIRROR HEATER FUNCTION)
(a) Select the ACTIVE TEST, use Techstream to generate a control command, and then check the mirror heater function.
Front multiplex network door ECU LH, RH:
Result:
Front multiplex network door ECU LH:
Result:
Front multiplex network door ECU RH:
D -- CHECK FRONT MULTIPLEX NETWORK DOOR ECU RH
C -- INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH (MIRROR HEATER)
B -- CHECK FRONT MULTIPLEX NETWORK DOOR ECU LH
A -- Continue to next step.
3. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY LH (MIRROR HEATER)
(a) Remove the mirror LH.
(b) Check the operation of the mirror heater.
(1) Measure the resistance between terminals 4 and 12 of the connector.
Standard resistance:
3.6 to 4.8 Ohms at 25°C (75 °F)
(2) Apply battery voltage and check the mirror heater operation.
OK:
HINT
It will take a short time for the mirror to become warm.
NG -- REPLACE OUTER REAR VIEW MIRROR ASSEMBLY LH
OK -- REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH
4. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH (MIRROR HEATER)
(a) Remove the mirror RH.
(b) Check the operation of the mirror heater.
(1) Measure the resistance between terminals 4 and 12 of the connector.
Standard resistance:
3.6 to 4.8 Ohms at 25°C (75°F)
(2) Apply battery voltage and check the mirror heater operation.
OK:
HINT
It will take a short time for the mirror to become warm.
NG -- REPLACE OUTER REAR VIEW MIRROR ASSEMBLY RH
OK -- REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH
5. CHECK FRONT MULTIPLEX NETWORK DOOR ECU LH
(a) Check if the malfunction disappears when a normally functioning front multiplex network door ECU LH is installed.
OK:
Mirror heater operates normally.
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
OK -- REPLACE FRONT MULTIPLEX NETWORK DOOR ECU LH
6. CHECK FRONT MULTIPLEX NETWORK DOOR ECU RH
(a) Check if the malfunction disappears when a normally functioning front multiplex network door ECU RH is installed.
OK:
Mirror heater operates normally.
NG -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
OK -- REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH