Windshield Deicer Does Not Operate

WINDOW / GLASS: WINDSHIELD DEICER SYSTEM: Windshield Deicer does not Operate
- Windshield Deicer does not Operate

DESCRIPTION

When the windshield deicer switch is turned on, a windshield deicer activation request signal is sent via the LIN communication line*1 or CAN communication line*2 to the air conditioning amplifier. Then the air conditioning amplifier operates the windshield deicer. When the on signal from the switch is received, the deicer relay (DEICER) is operated for 15 minutes. Also, if the off signal from the switch is received within 15 minutes, the deicer relay (DEICER) operation is stopped.

HINT
*1: w/o Multi-display

*2: w/ Multi-display

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK FOR DTC

(a) Check for DTC.

Result





C -- GO TO CAN COMMUNICATION SYSTEM CAN Communication System

B -- GO TO LIN COMMUNICATION SYSTEM LIN Communication System
A -- Continue to next step.

2. PERFORM ACTIVE TEST USING TECHSTREAM (DEICER RELAY)

(a) Select the Active Test using the Techstream to generate a control command, and then check that the windshield deicer operates.

Air Conditioner





Result





C -- INSPECT FUSE (LH-IG, DEICER)

B -- REPLACE MULTI-DISPLAY
A -- Continue to next step.

3. REPLACE AIR CONDITIONING CONTROL ASSEMBLY

(a) Temporarily replace the air conditioning control assembly with a new or normally functioning one Removal.

NEXT -- Continue to next step.

4. CHECK WINDSHIELD DEICER SYSTEM

(a) Turn the engine switch on (IG).

(b) Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.

(c) Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.

OK:

Windshield deicer system functioning normally.

NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal

OK -- END (AIR CONDITIONING CONTROL ASSEMBLY IS DEFECTIVE)

5. REPLACE MULTI-DISPLAY

(a) Temporarily replace the multi-display with a new or normally functioning one Removal.

NEXT -- Continue to next step.

6. CHECK WINDSHIELD DEICER SYSTEM

(a) Turn the engine switch on (IG).

(b) Check that pressing the windshield deicer switch illuminates the indicator and warms the front windshield surface.

(c) Check that after approximately 15 minutes, the indicator light turns off and the windshield deicer deactivates.

OK:

Windshield deicer system functioning normally.

NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal

OK -- END (MULTI-DISPLAY IS DEFECTIVE)

7. INSPECT FUSE (LH-IG, DEICER)

(a) Remove the LH-IG fuse from the main body ECU.

(b) Remove the DEICER fuse from the engine room junction block.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPLACE FUSE
OK -- Continue to next step.

8. INSPECT DEICER RELAY





(a) Remove the deicer relay from the engine room relay block.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPLACE DEICER RELAY
OK -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (DEICER RELAY - AIR CONDITIONING AMPLIFIER AND BATTERY)





(a) Remove the deicer relay from the engine room relay block.

(b) Disconnect the E36 air conditioning amplifier 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:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (DEICER RELAY - WINDSHIELD DEICER WIRE)





(a) Remove the deicer relay from the engine room relay block.

(b) Disconnect the A23 windshield deicer wire connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

11. CHECK HARNESS AND CONNECTOR (WINDSHIELD DEICER WIRE - BODY GROUND)





(a) Disconnect the A23 windshield deicer wire connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

12. CHECK WINDSHIELD DEICER WIRE





(a) Disconnect the A23 windshield deicer wire connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





NG -- REPLACE AIR CONDITIONING AMPLIFIER Removal

OK -- REPLACE WINDSHIELD GLASS Removal