Initialization

1. STEP MOTORS INITIALIZING FUNCTION

(a) Step motor initializing procedure (Automatic initializing).

(1) When the battery is reconnected and the ignition switch is turned to the on (IG) for the first time, the initializing function of the step motors is activated. IN this case, the "FRONT DEF" indicator blinks. HINT:

Initialization will be automatically completed after several seconds.

Rr. DEF Switch

Rr. DEF Switch

N I046102E04

(2) If mode indication is different from the actual air outlet in actuator check, turn the ignition switch on (IG) while pressing the "Rr, DEF" and "OFF" switches simultaneously. Step motor initialization occurs and the "FRONT DEF" indicator blinks.

Seat Heater Switch Circuit

DESCRIPTION

Voltage of 5 V is output from the S5-4 terminal of the A/C amplifier to the seat heater SW. The SW4 and SW5 terminals of the A/C amplifier read changes in voltage sent back from the seat heater SW. The voltage sent back from the seat heater SW differs according to the set temperature of the seat heater SW.

WIRING DIAGRAM

D27 Seat Heater SW

A/C Amplifier

D27 Seat Heater SW

A/C Amplifier

INSPECTION PROCEDURE

INSPECT AIR CONDITIONING AMPLIFIER

(a) Remove the A/C amplifier with connectors still connected.

(b) Turn the ignition switch on (IG).

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

Voltage

Tester connection (Symbols)

Condition

Specified condition

D38-7 (S5-4) - D38-10 (SG-4)

Ignition switch on (IG)

4.5 to 5.5 V

D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4)

Seat heater switch: COOL (HI)

0.17 V

D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4)

Seat heater switch: COOL (MID)

0.48 to 1.17 V

D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4)

Seat heater switch: COOL (LO)

1.31 to 2.01 V

D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4)

Seat heater switch: OFF

2.15 to 2.83 V

D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4)

Seat heater switch: HOT (LO)

2.97 to 3.67 V

D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4)

Seat heater switch: HOT (MID)

3.81 to 4.49 V

D38-3 (SW4), D38-2 (SW5) - D38-10 (SG-4)

Seat heater switch: HOT (HI)

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - SEAT HEATER SWITCH)

(a) Disconnect the connector from A/C amplifier.

(b) Disconnect the connector from the seat heater switch.

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

Resistance

Tester connection (Symbols)

Condition

Specified condition

D38-3 (SW4) - D27-3 (RVL)

Always

Below 1 Q

D38-2 (SW5) - D27-1 (RVR)

Always

Below 1 Q

D38-7 (S5-4) - D27-6 (SW+)

Always

Below 1 Q

D38-10 (SG-4) - D27-4 (SW-)

Always

Below 1 Q

D38-3 (SW4) - Body ground

Always

10 kQ or higher

D38-2 (SW5) - Body ground

Always

10 kQ or higher

D38-7 (S5-4) - Body ground

Always

10 kQ or higher

D38-10 (SG-4) - Body ground

Always

10 kQ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT SEAT HEATER SWITCH

D-side:

5

4

2

1

10

9

8

7

5

4

3

2

10

9

8

7

(a) Connect the 3 dry cell batteries (1.5 V) in series.

(b) Remove the seat heater switch.

(c) Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead from the battery to terminal 4.

(d) Measure the voltage between terminals 3*1, 1*2 and 4 according to the value(s) in the table below. Voltage

C129710E01

Tester connection (Symbols)

Condition

Specified condition

D27-6 (SW+) - D27-4 (SW-)

Always

4.0 to 5.0 V

D27-3 (RVL)*1, D27-1 (RVR)*2- D27-4 (SW-)

Seat heater switch: COOL (HI)

0.15 V

D27-3 (RVL)*1, D27-1 (RVR)*2 - D27-4 (SW-)

Seat heater switch: COOL (MID)

0.43 to 1.05 V

D27-3 (RVL)*1, D27-1 (RVR)*2 - D27-4 (SW-)

Seat heater switch: COOL (LO)

1.18 to 1.81 V

D27-3 (RVL)*1, D27-1 (RVR)*2 - D27-4 (SW-)

Seat heater switch: OFF

1.94 to 2.55 V

D27-3 (RVL)*1, D27-1 (RVR)*2 - D27-4 (SW-)

Seat heater switch: HOT (LO)

2.67 to 3.30 V

D27-3 (RVL)*1, D27-1 (RVR)*2 - D27-4 (SW-)

Seat heater switch: HOT (MID)

3.43 to 4.04 V

Tester connection (Symbols)

Condition

Specified condition

D27-3 (RVL)*1, D27-1 (RVR)*2 - D27-4 (SW-)

Seat heater switch: HOT (HI)

*2: Front passenger side err:)

REPLACE SEAT HEATER SWITCH

REPLACE AIR CONDITIONING AMPLIFIER

Seat Heater Switch Indicator Circuit

DESCRIPTION

Battery voltage is supplied to the seat heater switch through the S-HTR fuse. When the seat heater switch is turned on, the seat heater switch indicator comes on.

WIRING DIAGRAM

Seat Heater SW

A/C Amplifier

A/C Amplifier

I046110E01

INSPECTION PROCEDURE

INSPECT FUSE (ECU IG NO. 1)

Instrument Panel J/B:

□□□□□□□□□□□□□□□□ 0ODDDOODDOOODDOO

(a) Remove the ECU IG NO. 1 fuse from the instrument panel J/B.

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

Resistance

Tester item

Condition

Specified condition

IG NO. 1 fuse

Always

Below 1 Q

REPLACE FUSE (ECU IG NO. 1)

REPLACE FUSE (ECU IG NO. 1)

CHECK HARNESS AND CONNECTOR (SEAT HEATER SWITCH - BATTERY)

(a) Disconnect the connector from seat heater switch.

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

Voltage

Tester connection (Symbols)

Condition

Specified condition

D27-2 (IG) - Body ground

Ignition switch on (IG)

10 to 14 V

D27-2 (IG) - Body ground

Ignition switch off

Below 1 V

REPAIR OR REPLACE HARNESS OR CONNECTOR

INSPECT SEAT HEATER SWITCH

Seat Heater Switch Connector Wire Harness View:

Seat Heater Switch Connector Wire Harness View:

lindr indl

(a) Reconnect the connector to the seat heater switch.

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

Voltage lindr indl

Tester connection (Symbols)

Condition

Specified condition

D27-10 (INDR) - Body ground

Ignition switch on (IG)

10 to 14 V

D27-9 (INDL) - Body ground

Ignition switch on (IG)

10 to 14 V

D27-10 (INDR) - Body ground

Ignition switch off

Below 1 V

D27-9 (INDL) - Body ground

Ignition switch off

REPLACE SEAT HEATER SWITCH

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - SEAT HEATER SWITCH)

Air Conditioning Amplifier Connector Wire Harness View:

SCRI

SCRI

SCII

SCII

(a) Disconnect the connector from A/C amplifier.

(b) Disconnect the connector from the seat heater switch.

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

Resistance

Tester connection (Symbols)

Condition

Specified condition

D37-6 (SCRI) - D27-10 (INDR)

Always

Below 1 Q

D37-4 (SCLI) - D27-9 (INDL)

Always

Below 1 Q

D37-6 (SCRI) - D27-10 (INDR)

Always

10 kQ or higher

D37-4 (SCLI) - D27-9 (INDL)

Always

10 kQ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

REPLACE AIR CONDITIONING AMPLIFIER

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