Toyota Tacoma (2015-2018) Service Manual: Air Mix Damper Control Servo Motor Circuit (Driver Side) (B1446/46)

Toyota Tacoma (2015-2018) Service Manual / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Air Mix Damper Control Servo Motor Circuit (Driver Side) (B1446/46)

DESCRIPTION

This No. 3 air conditioning radiator damper servo sub-assembly (for driver side air mix) is controlled by the air conditioning amplifier assembly and moves the air mix damper (for driver side) to the desired position.

DTC No.	DTC Detection Condition	Trouble Area
B1446/46	Air mix damper position sensor (for driver side) value does not change even if air conditioning amplifier assembly operates air mix damper servo motor (for driver side)	No. 3 air conditioning radiator damper servo sub-assembly (for driver side air mix) Harness or connector Air conditioning amplifier assembly

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Operate the driver side temperature switch.

(e) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(f) Check the value(s) by referring to the table below.

Air Conditioner

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Air Mix Damper Position (Driver Side)	Air mix damper servo motor (for driver side) actual position / Min.: -14.0% Max.: 113.5%	MAX COOL: 0.0% MAX HOT: 100.0%	-
Air Mix Damper Target (Driver Side)	Air mix damper servo motor (for driver side) target position / Min.: -14.0% Max.: 113.5%	MAX COOL: 0.0% MAX HOT: 100.0%	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Air Mix Damper Position (Driver Side)

Air mix damper servo motor (for driver side) actual position /

Min.: -14.0%

Max.: 113.5%

MAX COOL: 0.0%

MAX HOT: 100.0%

Air Mix Damper Target (Driver Side)

Air mix damper servo motor (for driver side) target position /

Min.: -14.0%

Max.: 113.5%

MAX COOL: 0.0%

MAX HOT: 100.0%

OK:

The display is as specified in the Normal Condition column.

Result	Proceed to
NG	A
OK (When troubleshooting according to Problem Symptoms Table)	B
OK (When troubleshooting according to the DTC)	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

2.	INSPECT NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FOR DRIVER SIDE AIR MIX)

(a) Remove the No. 3 air conditioning radiator damper servo sub-assembly (for driver side air mix) (See page (b) Inspect the No. 3 air conditioning radiator damper servo sub-assembly (for ).

(b) Inspect the No. 3 air conditioning radiator damper servo sub-assembly (for driver side air mix) (See page ).

REPLACE NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FOR DRIVER SIDE AIR MIX)

3.	CHECK HARNESS AND CONNECTOR (NO. 3 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the D30 No. 3 air conditioning radiator damper servo sub-assembly (for driver side air mix) connector.

(b) Disconnect the A35 air conditioning amplifier assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D30-6 (MCD) - A35-12 (AMDC)	Always	Below 1 Ω
D30-7 (MHD) - A35-11 (AMDH)	Always	Below 1 Ω
D30-6 (MCD) or A35-12 (AMDC) - Body ground	Always	10 kΩ or higher
D30-7 (MHD) or A35-11 (AMDH) - Body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

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