DTC P1508-208: PTC A/C Auxiliary Heater Disabled High: Procedure

1. Turn the power switch off.
2. Disconnect the No. 2 battery pack wire connector. Refer to REMOVAL .
   Fig 1: Identifying No. 2 Battery Pack Wire Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Turn the power switch on (IG).
   NOTE:

   Turning the power switch on (IG) with the No. 2 battery pack wire connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

4. Measure the voltage according to the value(s) in the table below.
   Fig 2: Identifying NS1 No. 2 Battery Pack Wire Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   nS1-15 (DCIM) - Body ground	Power switch on (IG)	Below 1 V

NG → See step   4 

OK: Go to next step 

1. Turn the power switch off.
2. Remove the service plug grip. Refer to PRECAUTION .
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY) unless instructed by the repair information because this may cause a malfunction.

3. Check the connection of the low voltage connector of the hybrid vehicle converter.
   Fig 3: Locating Hybrid Vehicle Converter Low Voltage Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 4: Locating Hybrid Vehicle Converter Low Voltage Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connector is connected securely and there are no contact problems.

   HINT: 

   For the removal and installation procedures related to inspection of the connection of the low voltage connector of the hybrid vehicle converter. Refer to COMPONENTS .

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check that the service plug grip is not installed.
2. Disconnect the low voltage connector from the hybrid vehicle converter.

   HINT: 

   For the removal and installation procedures related to the low voltage connector of the hybrid vehicle converter. Refer to COMPONENTS .

3. Measure the resistance according to the value(s) in the table below.
   Fig 5: Identifying NS1 No. 2 Battery Pack Wire Connector And Z82 Hybrid Vehicle Converter Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   nS1-15 (DCIM) - Other terminals	Power switch off	10 kΩ or higher
   z82-12 (DCIM) - Other terminals	Power switch off	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   5 

1. Turn the power switch off.
2. Disconnect connector A74 from the hybrid vehicle control ECU.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.
   Fig 6: Identifying Connector A74 For Hybrid Vehicle Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   Turning the power switch on (IG) with the hybrid vehicle control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

   Standard voltage

   Tester Connection	Switch Condition	Specified Condition
   A74-8 (DCIM) - Body ground	Power switch on (IG)	Below 1 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6