Auxiliary Heater Element Relay: Testing and Inspection

AIR CONDITIONING: PTC HEATER RELAY: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
CAUTION:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
- When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.





2. REMOVE PTC HEATER RELAY (PTC HTR 1, PTC HTR 3)
(a) Remove the 3 PTC heater relays from the No. 5 relay box.






3. INSPECT PTC HEATER RELAY (PTC HTR 1, PTC HTR 3)
(a) Measure the resistance of the magnet clutch relay.
Standard resistance:





- If the result is not as specified, replace the relay.

4. INSTALL PTC HEATER RELAY
5. CONNECT CABLE TO NEGATIVE BATTERY TERMINAL
NOTE: When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

6. PERFORM INITIALIZATION
(a) Perform initialization Repair Instruction - Initialization.
NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.