1.CHECK FUSE

1. Turn ignition switch OFF.
2. Check taht the following fuse are not fusing.

- 10A fuse [No.10 located in fuse block (J/B)]

Is the inspection result normal?
YES>>GO TO 2.
NO>>Replace the blown fuse after repairing the affected circuit if a fuse is blown.
2.CHECK HORN RELAY 2 POWER SUPPLY

1. Disconnect horn relay 2 connector.
2. Check voltage between horn relay 2 connector and ground.

Horn relay 2 | Ground | Voltage (V) (Approx.)
Connector | Terminal
E18 | 2 | Battery voltage

Is the inspection result normal?
YES>>GO TO 3.
NO>>Check horn relay 2 power supply circuit.
3.CHECK VEHICLE SECURITY HORN POWER SUPPLY

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

   Vehicle security horn | Ground | Test item | Voltage (V) (Approx.)
   Connector | Terminal
   E32 | 1 | HORN | ON | Battery voltage → 0 → Battery voltage
   Other than above | Battery voltage

Is the inspection result normal?
YES>>GO TO 4.
NO>>GO TO 5.
4.CHECK VEHICLE SECURITY HORN GROUND

1. Turn ignition switch OFF.
2. Disconnect vehicle security horn connector.
3. Check continuity between vehicle security horn connector and ground.

   Vehicle security horn | Ground | Continuity
   Connector | Terminal
   E33 | 2 | Existed

Is the inspection result normal?
YES>>Replace vehicle security horn.
NO>>Repair or replace harness.
5.CHECK HORN RELAY 2 CIRCUIT

1. Disconnect horn relay 2 connector.
2. Check continuity between vehicle secuity horn harness connector and horn relay 2 connector.

   Vehicle security horn | Horn relay 2 | Continuity
   Connector | Terminal | Connector | Terminal
   E32 | 1 | E18 | 3 | Existed

3. Check continuity between driver seat control unit harness connector and ground.

   Vehicle security horn | Ground | Continuity
   Connector | Terminal
   E32 | 1 | Not existed

Is the inspection result normal?
YES>>GO TO 6.
NO>>Repair or replace harness.
6.CHECK HORN RELAY 2
Check horn relay 2.
Refer to Component Inspection.
Is the inspection result normal?
YES>>GO TO 7.
NO>>Replace horn relay 2.
7.CHECK HORN RELAY 2 CIRCUIT 1

1. Disconnect diode connector.
2. Check continuity between diode harness connector and horn relay 2 hareness connector.

   Diode | Horn relay 2 | Continuity
   Connector | Terminal | Connector | Terminal
   E107 | 1 | E18 | 1 | Existed

3. Check continuity between diode harness connector and ground.

   Diode | Ground | Continuity
   Connector | Terminal
   E107 | 1 | Not existed

Is the inspection result normal?
YES>>GO TO 8.
NO>>Repair or replace harness.
8.CHECK HORN RELAY 2 CIRCUIT 2

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

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

3. Check continuity between diode harness connector and ground.

   Diode | Ground | Continuity
   Connector | Terminal
   E107 | 2 | Not existed

Is the inspection result normal?
YES>>GO TO 9.
NO>>Repair or replace harness.
9.CHECK DIODE
Check diode.
Refer to Component Inspection.
Is the inspection result normal?
YES>>Replase IPDM E/R. Refer to Removal and Installation.
NO>>Replase diode.