DTC B1A63:12, B1A63:13, B1A64:12, B1A64:13 [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)]

id0702k2730000

System malfunction location	•  B1A63:12: Solar radiation sensor (RH) circuit short to power supply •  B1A63:13: Solar radiation sensor (RH) circuit open •  B1A64:12: Solar radiation sensor (LH) circuit short to power supply •  B1A64:13: Solar radiation sensor (LH) circuit open
Detection condition	•  Malfunction in wiring harness between solar radiation sensor and climate control unit
Fail-safe function	Malfunction determined when ignition switched ON •  The solar radiation sensor input value is fixed at the value directly before the malfunction only when the input value is 4.9V or more. Malfunction already exists when ignition switched ON •  Solar radiation sensor value is fixed at 0 W/m2.
Possible cause	•  Solar radiation sensor connector or terminal malfunction •  Climate control unit connector or terminal malfunction •  Light amount shone on the solar radiation sensor is insufficient (Circuit is normal) •  Solar radiation sensor malfunction •  Open circuit in wiring harness between the following terminals: ―  Climate control unit terminal 1U—solar radiation sensor terminal A ―  Climate control unit terminal 1B—solar radiation sensor terminal C ―  Climate control unit terminal 1O—solar radiation sensor terminal B •  Short to power supply in wiring harness between the following terminals: ―  Climate control unit terminal 1U—solar radiation sensor terminal A ―  Climate control unit terminal 1B—solar radiation sensor terminal C ―  Climate control unit terminal 1O—solar radiation sensor terminal B •  Climate control unit malfunction

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT SOLAR RADIATION SENSOR CONNECTOR •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the solar radiation sensor connector. (See SOLAR RADIATION SENSOR REMOVAL/INSTALLATION.) •  Inspect the connector and terminals (corrosion, damage, pin disconnection). •  Are the connector and terminals normal?	Yes	Go to the next step.
		No	Repair/replace the connector or terminal. After repair procedure, go to Step 6.
2	INSPECT SOLAR RADIATION SENSOR •  Inspect the solar radiation sensor. (See SOLAR RADIATION SENSOR INSPECTION.) •  Is it normal?	Yes	Go to the next step.
		No	Replace the solar radiation sensor. (See SOLAR RADIATION SENSOR REMOVAL/INSTALLATION.) Go to Step 6.
3	INSPECT SOLAR RADIATION SENSOR CIRCUIT FOR OPEN CIRCUIT •  Disconnect the climate control unit connector. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) •  Inspect for continuity between the following terminals (wiring harness-side): ―  Climate control unit terminal 1U—solar radiation sensor terminal A ―  Climate control unit terminal 1B—solar radiation sensor terminal C ―  Climate control unit terminal 1O—solar radiation sensor terminal B •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and solar radiation sensor terminal. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has an open circuit. Go to Step 6.
4	INSPECT SOLAR RADIATION SENSOR CIRCUIT FOR SHORT TO POWER SUPPLY •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on). •  Measure the voltage at the following terminals (wiring harness-side): ―  Climate control unit terminal 1U ―  Climate control unit terminal 1B ―  Climate control unit terminal 1O •  Is the voltage 0 V?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between climate control unit terminal and solar radiation sensor terminal. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a short to power supply. Go to Step 6.
5	VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Inspect the connector and terminals (corrosion, damage, pin disconnection). •  Are the connector and terminals normal?	Yes	Go to the next step.
		No	Repair/replace the connector or terminal. After repair procedure, go to the next step.
6	VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN •  Reconnect the disconnected connectors. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Clear the DTC from the climate control unit memory using the M-MDS. (See CLEARING DTC [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) •  Perform the DTC inspection for the climate control unit using the M-MDS. (See DTC DISPLAY [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].) •  Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the climate control unit. (See CLIMATE CONTROL UNIT REMOVAL/INSTALLATION.) Go to the next step.
		No	Go to the next step.
7	VERIFY THAT NO OTHER DTCs ARE PRESENT •  Verify other DTCs displayed. •  Are any other DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [CLIMATE CONTROL UNIT (FULL-AUTO AIR CONDITIONER)].)
		No	DTC troubleshooting completed.