AIR CONDITIONING SYSTEM, Diagnostic DTC:B1454/54

DTC Code	DTC Name
B1454/54	Passenger Side Air Outlet Damper COOL Control Servo Motor Circuit

DESCRIPTION

for LHD
The No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) to the appropriate position. As a result, the amount of air passing through the heater core after passing the evaporator is adjusted, and the temperature of the air blowing toward the passenger seat side is controlled. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

for RHD
The No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) to the appropriate position. As a result, the amount of air passing through the heater core after passing the evaporator is adjusted, and the temperature of the air blowing toward the passenger seat side is controlled. The air conditioning amplifier assembly communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness assembly.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Memory
B1454/54	Passenger Side Air Outlet Damper COOL Control Servo Motor Circuit	Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)2 or No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)3	No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)2 No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)3 Air conditioning harness assembly Air conditioning amplifier assembly	Memorized (30 sec. or more)*1

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1454/54

Passenger Side Air Outlet Damper COOL Control Servo Motor Circuit

Air mix damper position sensor value does not change even if air conditioning amplifier assembly operates No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)*2 or No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)*3

No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)*2
No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix)*3
Air conditioning harness assembly
Air conditioning amplifier assembly

Memorized

(30 sec. or more)*1

*1: The air conditioning amplifier assembly stores this DTC if the malfunction has occurred for the period of time indicated in the brackets.
*2: for LHD
*3: for RHD

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Tech Tips

Confirm that no mechanical problem is present because this DTC can be output when either a damper link or damper is mechanically locked.

PROCEDURE

CONFIRM MODEL

Result

Proceed to
for LHD
for RHD

for RHD

READ VALUE USING GTS Click here

for LHD

READ VALUE USING GTS

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Operate the front passenger side temperature adjustment switch. (for Dual Type)
Operate the temperature adjustment switch. (for Single Type)
Enter the following menus: Body Electrical / Air Conditioner / Data List.

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

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
COOL A/M Servo Targ Pls(P)	No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) target pulse	Min.: 128 Max.: 383	MAX. COLD: 254 (pulse) MAX. HOT: 360 (pulse)	-
COOL A/M Servo Actual Pulse(P)	No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) actual pulse	Min.: 128 Max.: 383	MAX. COLD: 254 (pulse) MAX. HOT: 360 (pulse)	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

COOL A/M Servo Targ Pls(P)

No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) target pulse

Min.: 128

Max.: 383

MAX. COLD: 254 (pulse)
MAX. HOT: 360 (pulse)

COOL A/M Servo Actual Pulse(P)

No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) actual pulse

Min.: 128

Max.: 383

MAX. COLD: 254 (pulse)
MAX. HOT: 360 (pulse)

Body Electrical > Air Conditioner > Data List

Tester Display
COOL A/M Servo Targ Pls(P)
COOL A/M Servo Actual Pulse(P)

OK
When the front passenger side temperature adjustment switch is turned from MAX COLD to MAX HOT, the actual pulse changes following the target pulse. (for Dual Type)
When the temperature adjustment switch is turned from MAX COLD to MAX HOT, the actual pulse changes following the target pulse. (for Single Type)

Result

Result	Proceed to
Target pulse changes but actual pulse does not change	A
Target pulse and actual pulse do not change	B
Actual pulse changes following the target pulse (When troubleshooting according to the DTC)	C
Actual pulse changes following the target pulse (When troubleshooting according to Problem Symptoms Table)	D

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

RECONFIRM DTC OUTPUT Click here

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

REPLACE NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX)

Replace the No. 4 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix).

Click here

Tech Tips

Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1454/54 is output	A
DTC B1454/54 is not output	B

END (NO. 4 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX) WAS DEFECTIVE)

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Replace the air conditioning harness assembly.

Click here

Tech Tips

Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1454/54 is output	A
DTC B1454/54 is not output	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

RECONFIRM DTC OUTPUT

Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1454/54 is output	A
DTC B1454/54 is not output	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

USE SIMULATION METHOD TO CHECK Click here

READ VALUE USING GTS

Connect the GTS to the DLC3.
Turn the power switch on (IG).
Turn the GTS on.
Operate the front passenger side temperature adjustment switch. (for Dual Type)
Operate the temperature adjustment switch. (for Single Type)
Enter the following menus: Body Electrical / Air Conditioner / Data List.

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

Body Electrical > Air Conditioner > Data List

Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
COOL A/M Servo Targ Pls(P)	No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) target pulse	Min.: 128 Max.: 383	MAX. COLD: 254 (pulse) MAX. HOT: 360 (pulse)	-
COOL A/M Servo Actual Pulse(P)	No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) actual pulse	Min.: 128 Max.: 383	MAX. COLD: 254 (pulse) MAX. HOT: 360 (pulse)	-

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

COOL A/M Servo Targ Pls(P)

No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) target pulse

Min.: 128

Max.: 383

MAX. COLD: 254 (pulse)
MAX. HOT: 360 (pulse)

COOL A/M Servo Actual Pulse(P)

No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix) actual pulse

Min.: 128

Max.: 383

MAX. COLD: 254 (pulse)
MAX. HOT: 360 (pulse)

Body Electrical > Air Conditioner > Data List

Tester Display
COOL A/M Servo Targ Pls(P)
COOL A/M Servo Actual Pulse(P)

OK
When the front passenger side temperature adjustment switch is turned from MAX COLD to MAX HOT, the actual pulse changes following the target pulse. (for Dual Type)
When the temperature adjustment switch is turned from MAX COLD to MAX HOT, the actual pulse changes following the target pulse. (for Single Type)

Result

Result	Proceed to
Target pulse changes but actual pulse does not change	A
Target pulse and actual pulse do not change	B
Actual pulse changes following the target pulse (When troubleshooting according to the DTC)	C
Actual pulse changes following the target pulse (When troubleshooting according to Problem Symptoms Table)	D

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

RECONFIRM DTC OUTPUT Click here

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

REPLACE NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX)

Replace the No. 5 air conditioning radiator damper servo sub-assembly (front passenger side lower air mix).

Click here

Tech Tips

Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or known good one and check that the condition returns to normal.

Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1454/54 is output	A
DTC B1454/54 is not output	B

END (NO. 5 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (FRONT PASSENGER SIDE LOWER AIR MIX) WAS DEFECTIVE)

REPLACE AIR CONDITIONING HARNESS ASSEMBLY

Replace the air conditioning harness assembly.

Click here

Tech Tips

Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or known good one and check that the condition returns to normal.

Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1454/54 is output	A
DTC B1454/54 is not output	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

RECONFIRM DTC OUTPUT

Check for DTCs.

Click here

Body Electrical > Air Conditioner > Trouble Codes

Result

Result	Proceed to
DTC B1454/54 is output	A
DTC B1454/54 is not output	B

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

USE SIMULATION METHOD TO CHECK Click here