Climate parameters
The Lexus IS has 16 climate parameters.
● Confirmed◆ In testing○ Supported× Not supported
Adjusted ambient temperature IS_ADJUSTED_AMBIENT_TConfirmed
- Request
21 3D - Service 21
PID 3D - Module
7C4 → 7CC - Every
5 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 7 of the reply, 8 bits.
0x94 = 148 → (148 × 81.6 ÷ 255 − 30.8) = 16.56 °C
- Formula
(val × 81.6 ÷ 255 − 30.8)- Range
- -30.8 to 50.8 °C
- Unit
- °C
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Air inlet damper actual pulse IS_AIR_INLET_DAMPER_ACTConfirmed
- Request
21 44 - Service 21
PID 44 - Module
7C4 - Every
1 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 8 to 15 of the reply, 8 bits.
0x4E = 78 → 78
- Formula
val- Range
- 0 to 255
- Unit
- Number
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Air inlet damper target pulse IS_AIR_INLET_DAMPER_TGTConfirmed
- Request
21 44 - Service 21
PID 44 - Module
7C4 - Every
1 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 7 of the reply, 8 bits.
0x4E = 78 → 78
- Formula
val- Range
- 0 to 255
- Unit
- Number
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Air outlet servo actual pulse, driver IS_AIR_OUTLET_SERVO_ACTConfirmed
- Request
21 43 - Service 21
PID 43 - Module
7C4 - Every
1 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 8 to 15 of the reply, 8 bits.
0x0C = 12 → 12
- Formula
val- Range
- 0 to 255
- Unit
- Number
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Air outlet servo pulse, driver IS_AIR_OUTLET_SERVO_PULSE_DConfirmed
- Request
21 43 - Service 21
PID 43 - Module
7C4 - Every
1 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 7 of the reply, 8 bits.
0x0C = 12 → 12
- Formula
val- Range
- 0 to 255
- Unit
- Number
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Ambient air temperature AATSAE J1979Confirmed
- Request
01 46 - Service 01
PID 46 - Module
7E0 → 7E8 - Every
15 s
Bits 0 to 7 of the reply, 8 bits.
- Formula
(val − 40)- Range
- -40 to 215 °C
- Unit
- °C
Confirmed for 2009, 2017, 2023, 2025. Supported for 2014, 2021 to 2022.
Ambient air temperature IS_AAT_7C4Confirmed
- Request
21 22 - Service 21
PID 22 - Module
7C4 → 7CC - Every
5 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 7 of the reply, 8 bits.
0x72 = 114 → (114 × 89.25 ÷ 255 − 23.3) = 16.6 °C
- Formula
(val × 89.25 ÷ 255 − 23.3)- Range
- -23.3 to 65.95 °C
- Unit
- °C
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Blower motor speed level IS_BLOWER_MOTOR_SPEED_LEVELConfirmed
- Request
21 3C - Service 21
PID 3C - Module
7C4 → 7CC - Every
5 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 7 of the reply, 8 bits.
0x01 = 1 → 1
- Formula
val- Range
- 0 to 255
- Unit
- Number
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Cabin temperature IS_CABIN_TConfirmed
- Request
21 21 - Service 21
PID 21 - Module
7C4 → 7CC - Every
5 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 7 of the reply, 8 bits.
0x77 = 119 → (119 × 63.75 ÷ 255 − 6.5) = 23.25 °C
- Formula
(val × 63.75 ÷ 255 − 6.5)- Range
- -6.5 to 57.25 °C
- Unit
- °C
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Communication with air conditioner IS_COMM_WITH_AIR_CONDITIONERConfirmed
- Request
21 24 - Service 21
PID 24 - Module
7E0 → 7E8 - Every
5 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bit 5 of the reply.
0b0 = 0 → 0
- Formula
val- Range
- 0 to 1
- Unit
- Off or on
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Communication with HV IS_COMMUNICATION_WITH_HVConfirmed
- Request
21 24 - Service 21
PID 24 - Module
7E0 → 7E8 - Every
5 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bit 2 of the reply.
0b0 = 0 → 0
- Formula
val- Range
- 0 to 1
- Unit
- Off or on
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Communication with valvematic IS_COMM_WITH_VALVEMATIC_COMMConfirmed
- Request
21 24 - Service 21
PID 24 - Module
7E0 → 7E8 - Every
5 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bit 6 of the reply.
0b0 = 0 → 0
- Formula
val- Range
- 0 to 1
- Unit
- Number
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Evaporator fin thermistor IS_EVAP_FIN_THERMISTORConfirmed
- Request
21 4B - Service 21
PID 4B - Module
7C4 → 7CC - Every
1 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 7 of the reply, 8 bits.
0x56 = 86 → (86 × 89.25 ÷ 255 − 29.7) = 0.4 °C
- Formula
(val × 89.25 ÷ 255 − 29.7)- Range
- -29.7 to 59.55 °C
- Unit
- °C
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Evaporator target temperature IS_EVAP_TARGET_TConfirmed
- Request
21 4C - Service 21
PID 4C - Module
7C4 - Every
5 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 15 of the reply, 16 bits.
0x8064 = 32868 → (32868 ÷ 100 − 327.68) = 1
- Formula
(val ÷ 100 − 327.68)- Range
- -327.68 to 327.67
- Unit
- Number
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
Set temperature, driver side IS_T_DRIVER
- Request
21 29 - Service 21
PID 29 - Module
7C4 → 7CC - Every
5 s - Testing
Bits 0 to 7 of the reply, 8 bits.
- Formula
val- Range
- 0 to 255 °C
- Unit
- °C
In testing for 1998 to 2022, 2024, 2026. Not supported for 2023, 2025.
Solar sensor, driver side IS_SOLAR_DRIVERConfirmed
- Request
21 24 - Service 21
PID 24 - Module
7C4 → 7CC - Every
1 s - Testing for 1998 to 2022, 2024, 2026
Example reply from a 2025 Lexus IS.
Bits 0 to 7 of the reply, 8 bits.
0x00 = 0 → 0
- Formula
val- Range
- 0 to 255
- Unit
- Number
Confirmed for 2023, 2025. In testing for 1998 to 2022, 2024, 2026.
