C1249 ABNORMALITY OF STOP LIGHT SWITCH

1. Set the starter switch to "LOCK", disconnect the 24 pin connector of ECU and the connector of stop light switch.
2. Check the continuity between 1st terminal of the 24 pin connector of ECU (chassis harness side) and 1st terminal of the switch connector (chassis harness side).
   Standard: Continuity
   
   
   　

Disconnection of the wire harness.

[1]-3

3. Connect all the connector, turn the starter switch to "ON".
4. Measure the voltage between 1st terminal of the 24 pin connector of ECU and 2nd terminal of the 31 pin connector of ECU. (Leaving the connector connected with ECU.)
   Standard: 20-28V
   
   
   　

Ground short of the wire harness.

[2] STOP LIGHT SWITCH CHECK

1. Turn the starter switch to "LOCK", disconnect the connector of stop light switch.
2. Measure the resistance between 1st and 3rd terminal of the stop light switch.
   Standard:
   Pushing in the shaft: Continuity
   Not pushing in the shaft: No continuity
   
   

Abnormality of the stop light switch.

Perform the engine ECU check because it is conceivable that abnormality of the signal transmitted from the stop light to engine ECU.

1. Confirm the DTC C1249 is inactive

   • 　Start the engine and let it idling condition.
   • Verify the DTC C1249 is inactive.

   

   DTC Clear

   • Clear the DTC with Hino DX
   • Confirm the same DTC is not reoccurred

   

C1249 is reoccur: Return to first process Other DTC appear: Refer to concerned Trouble shooting

Complete