1.CHECK HORN FUNCTION Check horn function with horn switch. Do the horns sound? YES>>GO TO 2. NO>>Refer to Wiring Diagram - HORN -.
2.CHECK HORN RELAY 1 POWER SUPPLY

1. Turn ignition switch ON.
2. Perform “ACTIVE TEST” (“HORN”) with CONSULT-Ill.
3. Check voltage between horn relay 1 connector and ground.

   Horn relay 1 | Ground | Test item | Voltage (V) (Approx.)
   Connector | Terminal
   E11 | 1 | HORN | ON | Battery voltage → 0 → Battery voltage
   Other than above | Battery voltage

Is the inspection result normal?
YES>>GO TO 6.
NO>>GO TO 4.
3.CHECK HORN RELAY 1 CIRCUIT 1

1. Turn ignition switch OFF.
2. Disconnect horn relay 1 connector and diode connector.
3. Check continuity between horn relay 1 harness connector and diode harness connector.

   Horn relay 1 | Diode | Continuity
   Connector | Terminal | Connector | Terminal
   E11 | 1 | E107 | 3 | Existed

4. Check continuity between horn relay 1 harness connector and ground.

   Horn relay 1 | Ground | Continuity
   Connector | Terminal
   E11 | 1 | Not existed

Is the inspection result normal?
YES>>GO TO 4.
NO>>Repair or replace harness.
4.CHECK HORN RELAY 1 CIRCUIT 2

1. Disconnect IPDM E/R connector.
2. Check continuity between IPDM E/R harness connector and diode connector.

   IPDM E/R | Diode | Continuity
   Connector | Terminal | Connector | Terminal
   E6 | 44 | E107 | 2 | Existed

3. Check continuity between IPDM E/R harness connector and ground.

   IPDM E/R | Ground | Continuity
   Connector | Terminal
   E6 | 44 | Not existed

Is the inspection result normal?
YES>>GO TO 5.
NO>>Repair or replace harness.
5.CHECK DIODE
Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 6.
NO>>Replace diode.
6.CHECK INTERMITTENT INCIDENT
Refer to Intermittent Incident.
Is the inspection result normal?
>>INSPECTION END