Honda SH300 2006 Manual page 494

IMMOBILIZER SYSTEM (HISS)
Immobilizer indicator remains on with the ignition switch ON
1. Immobilizer Receiver Jamming Inspection
Check that there is any metal obstruction or the other vehicle's transponder key near the immobilizer
receiver and key.
Is there any metal obstruction or the other key?
YES
NO
2. First Transponder Key Inspection
Turn the ignition switch ON with the spare transponder key and check the immobilizer indicator.
The indicator should come on for 2 seconds then go off.
Is there indicator go off?
YES
NO
3. Diagnostic Code Inspection
Perform the diagnostic code indication procedure (page 23-7) and check that the immobilizer indica-
tor comes on then it starts blinking.
Is there indicator Blinks or Stay Lit?
BLINKS–Read the diagnostic code (page 23-7).
STAY LIT–GO TO STEP 4.
4. Immobilizer indicator Line Inspection At The ECM Connector
Check the immobilizer indicator line (White/Red wire) at the ECM 33P connector (page 23-12).
Is the voltage specified?
YES
NO
23-10
– Remove it and recheck.
– GO TO STEP 2.
– Faulty first transponder key
– GO TO STEP 3.
– Replace the ECM with a new one, and recheck
– Short circuit in White/Red wire.