Toyota CH-R Service Manual: Short to GND or Open in Buzzer (C1ABE)

DESCRIPTION

  • DTC C1ABE is stored when the blind spot monitor sensor RH (Slave) detects a short to ground or open in the RCTA buzzer (blind spot monitor buzzer) circuit.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

C1ABE

Short to GND or Open in Buzzer

Both of the following conditions are met:
  • The blind spot monitor system is on
  • The blind spot monitor sensor is not sounding the buzzer but the buzzer receives voltage below a specified level for a specified period of time.
  • Blind spot monitor sensor RH (Slave)
  • RCTA buzzer (blind spot monitor buzzer)
  • Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot monitor system is turned on.
  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK DTC

(a) Turn the ignition switch off.

(b) Turn the ignition switch to ON.

(c) Recheck for DTCs and check if the same DTC is output again.

Body Electrical > Blind Spot Monitor Slave > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK HARNESS AND CONNECTOR (RCTA BUZZER - BATTERY AND BLIND SPOT MONITOR SENSOR RH (SLAVE))

(a) Disconnect the M64 RCTA buzzer (blind spot monitor buzzer) connector.

(b) Disconnect the M63 blind spot monitor sensor RH (Slave) connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

M64-2 (BZN) - M63-3 (BUZ)

Always

Below 1 Ω

M64-2 (BZN) - Body ground

Always

10 kΩ or higher

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

M64-1 (BZP) - Body ground

Ignition switch to ON

11 to 14 V

M64-1 (BZP) - Body ground

Ignition switch off

Below 1 V

*a

Component with harness connected

RCTA buzzer (blind spot monitor buzzer)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

REPLACE RCTA BUZZER (BLIND SPOT MONITOR BUZZER)

(a) Replace the RCTA buzzer (blind spot monitor buzzer).

Click here

NEXT

4.

CHECK DTC

(a) Clear the DTCs.

Click here

Body Electrical > Blind Spot Monitor Slave > Clear DTCs

(b) Recheck for DTCs and check if the same DTC is output again.

Body Electrical > Blind Spot Monitor Slave > Trouble Codes

OK:

No DTCs are output.

OK

END

NG

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