DTC C1AAE: Heater Circuit [10/2016 - 09/2020]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [10/2016 - 09/2020]

   Chassis > Front Recognition Camera > Clear DTCs 

2. Perform the following procedure.

   HINT: 

   If the following procedure is not performed, the previously output DTC cannot be detected.

   1. Turn the engine switch on (IG) and wait 7 seconds or more.
3. Check for DTCs.

   Refer to DTC CHECK / CLEAR [10/2016 - 09/2020]

   Chassis > Front Recognition Camera > Trouble Codes 

   Result

   Result	Proceed to
   DTC C1AAE is not output	A
   DTC C1AAE is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2016 - 10/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2020] 

Result: 

B 

See step  2

1. Turn the engine switch off.
2. Disconnect the S19 forward recognition with heater hood sub-assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S19-1 (IG1) - S19-2 (HTR)	Engine switch off	38 to 42 Ω

4. Connect the S19 forward recognition with heater hood sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY. Refer to  COMPONENTS [10/2016 - 09/2020] 

Result: 

OK 

See step  3

1. Disconnect the S19 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	Condition	Specified Condition
   S19-1 (IG1) - Body ground	Engine switch on (IG)	11 to 14 V
   	Engine switch off	Below 1.5 V

3. Connect the S19 forward recognition with heater hood sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  4

1. Disconnect the S19 forward recognition with heater hood sub-assembly connector.
2. Disconnect the S18 forward recognition camera connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S19-2 (HTR) - S18-1 (HTR)	Always	Below 1 Ω
   S19-2 (HTR) or S18-1 (HTR) - Body ground	Always	10 kΩ or higher

4. Connect the S18 forward recognition camera connector.
5. Connect the S19 forward recognition with heater hood sub-assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FORWARD RECOGNITION CAMERA. Refer to  COMPONENTS [10/2016 - 09/2020] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (FORWARD RECOGNITION WITH HEATER HOOD SUB-ASSEMBLY - FORWARD RECOGNITION CAMERA)