C1734
C1734 CONTROL UNITDescription
The BCM reads the air pressure signal received by the tire pressure receiver, and controls the low tire pressure warning lamp and the buzzer operations. It also has a judgment function to detect a system malfunction.
DTC Logic
C1734:
DTC CONFIRMATION PROCEDURE
1.VEHICLE DRIVING
With CONSULT-III
1. Drive at a speed 40 km/h (25 MPH) or more for several minutes without stopping.
2. Check all tire pressures with CONSULT-III "DATA MONITOR" within 15 minutes after vehicle speed become 17 km/h (11 MPH).
Does "DATA MONITOR" displayed the standardized value without turning low tire pressure warning lamp ON?
YES >> INSPECTION END
NO >> Go to diagnosis procedure. Refer to "Diagnosis Procedure".
Diagnosis Procedure
1.CHECK SELF-DIAGNOSTIC RESULTS
With CONSULT-III
1. On "SELECT DIAG" mode, select the "SELF-DIAG RESULT" screen.
2. Check display contents in self-diagnostic results.
Does self-diagnostic results indicate any malfunction?
YES >> Perform trouble diagnosis. Refer to WT-77, "DTC Index". Testing and Inspection
NO >> GO TO 2.
2.CHECK POWER SUPPLY
1. Turn ignition switch "OFF".
2. Disconnect BCM harness connector.
3. Check voltage between BCM harness connector terminals and ground.
Is the power supply normal?
YES >> GO TO 3.
NO >> Check the following. If any items are damaged, repair or replace damage parts.
^ 40A fusible link [No. K located in the fuse block].
^ 10A fuse [No. 10 located in the fuse block (J/B)].
^ Harness for short or open between battery and BCM harness connector M118 terminal 1.
^ Harness for short or open between battery and BCM harness connector M119 terminal 11.
^ Check Battery voltage.
3.CHECK GROUND CIRCUIT
1. Turn ignition switch "OFF".
2. Disconnect BCM harness connector.
3. Check continuity between BCM harness connector M119 terminal 13 and ground.
4. Also check harness for short to ground.
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair open circuit or short to power in harness or connectors.
4.CHECK HARNESS BETWEEN BCM AND TIRE PRESSURE RECEIVER
1. Turn ignition switch "OFF"
2. Disconnect BCM harness connector and tier pressure receiver harness connector.
3. Check continuity between BCM harness connector and tire pressure receiver harness connector.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair or replace damaged parts.
5.CHECK BCM
Check BCM input/output signal. Refer to WT-45, "Reference Value". Reference Value
Is the inspection result normal?
YES >> INSPECTION END
NO >> GO TO 6.
6.CHECK BCM HARNESS CONNECTOR
Check BCM pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES >> Replace BCM.
NO >> Repair or replace damaged parts.
Special Repair Requirement
1.CHECK TIRE AIR PRESSURE
Check all tire air pressures. Refer to WT-98, "Tire". [1][2]Specifications
Does all tire pressure data meet the specification?
YES >> GO TO 2.
NO >> Inspect or repair the tires or wheels and adjust the tire pressure to the specification.
2.PERFORM ID REGISTRATION
Perform ID registration. Refer to WT-5, "ID REGISTRATION PROCEDURE: Special Repair Requirement". Transmitter ID Registration Procedure
Can ID registration of all transmitters be completed?
YES >> END
NO >> GO TO 1.