Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota Corolla and 2005 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

CHECK LOW PITCHED HORN ASSY
1. Connect the positive (+) lead from the battery to the terminal and negative (-) lead to the horn body, and check that the horn sounds.
  
  Fig 1: Connecting Positive Lead From Battery To Terminal And Negative Lead
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPAIR OR REPLACE LOW PITCHED HORN ASSY
2. OK: GO TO NEXT STEP

CHECK RELAY (Marking: HORN)

Remove the relay from the engine room J/B.
Check the horn relay resistance, as shown in the illustration and table.

Standard:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
1 - 2	Always	Below 1 Ω
3 - 5	Apply B+ between terminals 1 and 2	Below 1 Ω

Fig 2: Checking Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE RELAY
OK: GO TO NEXT STEP

CHECK WIRE HARNESS (TVIP ECU - ENGINE ROOM J/B)

Remove the HORN relay from the engine room J/B.
Check the resistance between the terminals of the TVIP ECU and engine room J/B connectors, as shown in the illustration and table.

Standard:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Specified Condition

HORN (T3-5) - 2⁽¹⁾

Below 1 Ω

⁽¹⁾	Horn relay terminal

HINT:

Fig 3: Identifying Horn Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR
OK: GO TO NEXT STEP

CHECK WIRE HARNESS (ENGINE ROOM J/B - HORN)

Check the resistance between the terminals of the engine room J/B and horn connectors, as shown in the illustration and table. Standard:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection

Specified Condition

3⁽¹⁾ - Horn (H6-1)

Below 1 Ω

⁽¹⁾	Horn relay terminal

HINT:

Fig 4: Identifying Horn Relay

NG: REPAIR OR REPLACE WIRE HARNESS AND CONNECTOR
OK: GO TO NEXT STEP

CHECK AND REPLACE TVIP ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )