Toyota Tacoma (2015-2018) Service Manual: Air Inlet Damper Control Servo Motor Circuit (B1442/42)

Toyota Tacoma (2015-2018) Service Manual / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Air Inlet Damper Control Servo Motor Circuit (B1442/42)

DESCRIPTION

This No. 1 air conditioning servo assembly (fresh/recirculation damper) is controlled by the air conditioning amplifier assembly and moves the air inlet damper to the desired position.

DTC No.	DTC Detection Condition	Trouble Area
B1442/42	Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates air inlet damper servo motor.	No. 1 air conditioning servo assembly (fresh/recirculation damper) 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 recirculation/fresh 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 Inlet Damper Position	Air inlet damper servo motor actual position / Air inlet damper servo motor actual position / Min.: -14.0% Max.: 113.5%	FRESH: 0.0% RECIRCULATION: 100.0%	-
Air Inlet Damper Target	Air inlet damper servo motor target position / Min.: -14.0% Max.: 113.5%	FRESH: 0.0% RECIRCULATION: 100.0%	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Air Inlet Damper Position

Air inlet damper servo motor actual position /

Air inlet damper servo motor actual position / Min.: -14.0%

Max.: 113.5%

FRESH: 0.0%

RECIRCULATION: 100.0%

Air Inlet Damper Target

Air inlet damper servo motor target position /

Min.: -14.0%

Max.: 113.5%

FRESH: 0.0%

RECIRCULATION: 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. 1 AIR CONDITIONING SERVO ASSEMBLY (FRESH/RECIRCULATION DAMPER)

(a) Remove the No. 1 air conditioning servo assembly (fresh/recirculation damper) (See page (b) Inspect the No. 1 air conditioning servo assembly (fresh/recirculation damper) ).

(b) Inspect the No. 1 air conditioning servo assembly (fresh/recirculation damper) (See page ).

REPLACE NO. 1 AIR CONDITIONING SERVO ASSEMBLY (FRESH/RECIRCULATION DAMPER)

3.	CHECK HARNESS AND CONNECTOR (NO. 1 AIR CONDITIONING SERVO ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the D29 No. 1 air conditioning servo assembly (fresh/recirculation damper).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D29-6 (MREC) - A35-26 (AIR)	Always	Below 1 Ω
D29-7 (MFRS) - A35-25 (AIF)	Always	Below 1 Ω
D29-6 (MREC) or A35-26 (AIR) - Body ground	Always	10 kΩ or higher
D29-7 (MFRS) or A35-25 (AIF) - Body ground	Always	10 kΩ or higher

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Air Mix Damper Position Sensor Circuit (Driver Side) (B1436/36)

DESCRIPTION This sensor detects the position of the air mix damper (for driver side) and sends the appropriate signals to the air conditioning amplifier assembly. The position sensor is built int ...

Room Temperature Sensor Circuit (B1411/11)

DESCRIPTION The cooler thermistor (room temperature sensor) is installed in the instrument panel to detect the cabin temperature which is used to control the air conditioning system AUTO mode. Th ...

Other materials:

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

Removal
REMOVAL CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. REMOVE REAR DOOR FRAME GARNISH (See page ) 2. REMOVE REAR DOOR INSIDE HANDLE BEZEL PLUG (See page ) 3. REMOVE REAR ARMREST ...

System Diagram
SYSTEM DIAGRAM Circuit Description Component Outline Steering Lock ECU (Steering Lock Actuator or UPR Bracket Assembly) The steering is locked and unlocked by communicating with the certification ECU (smart key ECU assembly) via L ...