DTC P0070-15: Ambient Temperature Sensor Circuit Short to Battery or Open [08/2023 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY) CIRCUIT
Pre-procedure1
- Disconnect the A11 ambient temp. sensor (thermistor assembly) connector.
*a Front view of wire harness connector
(to Ambient Temp. Sensor (Thermistor Assembly))
- Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition Result A11-1 (+) - Body ground Ignition switch ON 0 to 5.5 V V Result
Proceed to OK NG
Post-procedure1
- None
Result:
NG
See step 5
Result:
OK
See step 2
- Disconnect the A11 ambient temp. sensor (thermistor assembly) connector.
- CLEAR DTC
Result:
NEXT
See step 3
- CHECK FOR DTC
Pre-procedure1
- Turn the ignition switch off.
- Disconnect the A11 ambient temp. sensor (thermistor assembly) connector.
*a Front view of wire harness connector
(to Ambient Temp. Sensor (Thermistor Assembly)) - Connect terminals 1 and 2 of the ambient temp. sensor (thermistor assembly) connector on the wire harness side.
*1 Ambient Temp. Sensor (Thermistor Assembly) *2 Air Conditioning Amplifier Assembly - Turn the ignition switch to ON and wait for 4 seconds or more.
- Check for DTCs.
Body Electrical > Air Conditioner > Trouble Codes
Result
Result Proceed to P0070-11 is output A P0070-15 is output B
Post-procedure1
- None
Result:
A
REPLACE AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY). Refer to REMOVAL [10/2022 - ]
Result:
B
See step 4
- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY))
Pre-procedure1
- Disconnect the A11 ambient temp. sensor (thermistor assembly) connector.
- Disconnect the C48 air conditioning amplifier assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Result A11-1 (+) - C48-1 (TAM) Always Below 1 Ω Ω A11-2 (-) - C48-14 (SG-2) Always Below 1 Ω Ω Result
Proceed to OK NG
Post-procedure1
- None
Result:
OK
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
- CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY))
Pre-procedure1
- Disconnect the A11 ambient temp. sensor (thermistor assembly) connector.
- Disconnect the C48 air conditioning amplifier assembly connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition Result A11-1 (+) or C48-1 (TAM) - Other terminals and body ground Always 10 kΩ or higher kΩ Result
Proceed to OK NG
Post-procedure1
- None
Result:
OK
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to REMOVAL [10/2022 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR