DTC C1AAE-00: Front Recognition Camera Heater Malfunction [11/2018 - 12/2021]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2018 - 12/2021]

   Chassis > Front Recognition Camera > Clear DTCs 

2. Make sure that the DTC detection conditions are met.

   HINT: 

   If the conditions are not met, the system cannot detect the malfunction.

   Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2018 - 06/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [06/2020 - 08/2020] , or refer to DIAGNOSTIC TROUBLE CODE CHART [08/2020 - 12/2021]

3. Recheck for DTCs and check that no DTCs are output.

   Refer to DTC CHECK / CLEAR [11/2018 - 12/2021]

   Chassis > Front Recognition Camera > Trouble Codes 

   OK

   DTC C1AAE-00 is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

NG 

See step  2

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Forward Recognition with Heater Hood Sub-assembly)

2. Disconnect the P17 forward recognition with heater hood sub-assembly connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   1 (IG1) - 2 (HTR)	Ignition switch off	28.5 to 31.5 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY. Refer to  REMOVAL [11/2018 - 12/2021] 

Result: 

OK 

See step  3

1. Disconnect the forward recognition with heater hood sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Forward Recognition with Heater Hood Sub-assembly)

2. Measure the voltage according to the value (s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   P17-1 (IG1) - Body ground	Ignition switch ON	8 to 16 V
   	Ignition switch off	Below 1.5 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the P17 forward recognition with heater hood sub-assembly connector.
2. Disconnect the P8 forward recognition camera connector.
3. Measure the resistance according to the value (s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P17-2 (HTR) - P8-1 (HTR)	Always	Below 1 Ω
   P17-2 (HTR) or P8-1 (HTR) - Body ground	Always	10 kΩ or higher

4. Reconnect the P8 forward recognition camera connector.
5. Reconnect the P17 forward recognition with heater hood sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  REMOVAL [11/2018 - 12/2021] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR