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Horn: Overview Lexus RX II рестайлинг

Horns 12 illustrations ~970 words
Fig. 1: Identifying Horn System Components Location
Scheme 1: Identifying Horn System Components Location
Fig. 2: Horn System Diagram
Scheme 2: Horn System Diagram

DESCRIPTION

Horns sound when the horn switch of the combination switch is pressed.

Scheme 1

Scheme 1: INSPECTION PROCEDURE
Scheme 1: INSPECTION PROCEDURE

Scheme 2

Scheme 2
Scheme 2

Scheme 3

Scheme 3
Scheme 3

Scheme 4

Scheme 4
Scheme 4

Scheme 5

Scheme 5
Scheme 5

Scheme 6

Scheme 6
Scheme 6
  1. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Disconnect the connector from the engine room J/B (power distributor). Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester connection Condition Specified condition 2B-9 - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (Scheme 1): Identifying Engine Room J/B OK: Go to next step
  2. CHECK MODE MONITOR TERMINAL (HORN RELAY) Preparation Connect the connector. Remove the cover of the fusible link block assembly. Set the vehicle to the following conditions: Combination switch on Check voltage Measure the voltage between the Mode Monitor Terminal and body ground. Standard voltage TERMINALS VOLTAGE CHART Result Proceed to 0 V or Approx. 12 V A Approx. 6.2 V B Approx. 2.0 V C B: GO TO step 4 C: GO TO step 11 (Scheme 2): Identifying Mode Monitor Terminal A: Go to next step
  3. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B - MODE MONITOR TERMINAL) Disconnect the connector from the engine room J/B. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester connection Condition Specified value 26-5 (MM) - Mode monitor terminal Always Below 1 ohms 2G-5 (MM) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (Scheme 3): Identifying Engine Room J/B And Mode Monitor Terminal OK: Go to next step
  4. INSPECT ENGINE ROOM J/B (HORN RELAY) Disconnect the battery negative terminal. Remove the engine room J/B. Inspect the HORN relay. (Scheme 4): Identifying Engine Room J/B (Horn Relay) Connect the positive battery lead to terminal 21-1 and 2B-9 of the engine room J/B and the negative lead to terminal 2H-13, 2F-1. SYMBOLS CONNECTION CHART Symbols (terminals No.) Connection 21-1, 2B-9-2H-13, 2F-1 Positive - Negative Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 2B-10 - Battery negative terminal Below 1 V Connect the battery negative lead to terminal 2H-9 of the J/B No.2. SYMBOLS CONNECTION CHART Symbols (terminals No.) Connection 2H-9 Negative Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 2B-10 - Battery negative terminal 10 to 14 V NG: REPLACE ENGINE ROOM J/B OK: Go to next step
  5. CHECK COMBINATION SWITCH OPERATION Disconnect the 11 (11-5) connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 11-5 - Body ground Switch OFF 10 kohms or higher 11-5 - Body ground Switch ON Below 1 ohms NG: GO TO step 10 OK: Go to next step
  6. CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B - HORN) Disconnect the 2B (2B-10), H15 (H15-1) and H16 (H16-1) connectors. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 2B-10 - H15-1 Always Below 1 ohms 2B-10 - H16-1 Always Below 1 ohms 2B-10 -Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  7. INSPECT HIGH PITCHED HORN ASSEMBLY Remove high pitched horn (See «HIGH PITCHED HORN»(ref-283017-S36966126122008041400000) ). Inspect high pitched horn (See «HIGH PITCHED HORN»(ref-283017-S36966126122008041400000) ). OK: High pitched horn sounds. NG: REPLACE HIGH PITCHED HORN ASSEMBLY OK: Go to next step
  8. INSPECT LOW PITCHED HORN ASSEMBLY Remove low pitched horn (See «LOW PITCHED HORN»(ref-283017-S04125513342008041400000) ). Inspect low pitched horn (See «LOW PITCHED HORN»(ref-283017-S04125513342008041400000) ). OK: Low pitched horn sounds. NG: REPLACE LOW PITCHED HORN ASSEMBLY OK: Go to next step
  9. CHECK HARNESS AND CONNECTOR Disconnect the 2H J/B No. 2 connector and 1D instrument panel J/B connector. (Scheme 5): Identifying 2H J/B No. 2 Connector And 1D Instrument Panel J/B Connector Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 2H-9 - 1 D-11 Below 1 ohms 2H-9 or 1D-11 - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
  10. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL J/B - COMBINATION SWITCH) Disconnect the C13 (C13-8) connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition 11-5 - C16-6 Always Below 1 ohms 11-5 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE COMBINATION SWITCH
  11. CHECK HARNESS AND CONNECTOR (SHORT CIRCUIT DRIVEN SIDE BY RELAY) Preparation For easier disconnection, remove the engine room J/B and then take apart the connectors. Disconnect only the connector "2B". Check voltage Measure the voltage between the Mode Monitor Terminal and body ground. Standard voltage TERMINALS VOLTAGE CHART Result Proceed to Approx. 6.2 V A Approx. 2.0 V B B: REPLACE ENGINE ROOM J/B (Scheme 6): Identifying Engine Room J/B And Connectors A: REPAIR OR REPLACE HARNESS OR CONNECTOR
Fig. 10: Identifying Low Pitched Horn Components With Torque Specifications
Scheme 10: Identifying Low Pitched Horn Components With Torque Specifications

Scheme 7

Scheme 7: REMOVAL
Scheme 7: REMOVAL

Scheme 8

Scheme 8
Scheme 8
  1. REMOVE COOL AIR INTAKE DUCT SEAL Remove the 4 clips and cool air intake duct seal. (Scheme 7): Locating Cool Air Intake Duct Seal With Clips
  2. REMOVE LOW PITCHED HORN Disconnect the connector. Remove the bolt and the low pitched horn. (Scheme 8): Locating Low Pitched Horn And Bolt

Scheme 9

Scheme 9: INSPECTION
Scheme 9: INSPECTION
  1. INSPECT LOW PITCHED HORN Apply battery voltage and check operation of the horn, as shown in the table. Standard MEASUREMENT CONNECTION SPECIFIED CONDITION CHART Measurement Condition Specified Condition Battery positive (+) --> Terminal 1 Battery negative (-) --> Body ground Horn sounds (Scheme 9): Applying Battery Voltage And Checking Operation Of High Pitched Horn

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