Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Short to +B in Buzzer (C1ABD,C1ABE)

DESCRIPTION

  • DTC C1ABD is stored when the blind spot monitor sensor RH detects a +B short in rear cross traffic alert buzzer (blind spot monitor buzzer) circuit.
  • DTC C1ABE is stored when the blind spot monitor sensor RH detects a ground short or open in rear cross traffic alert buzzer (blind spot monitor buzzer) circuit.

DTC Code

DTC Detection Condition

Trouble Area

C1ABD

  • Both of the following conditions are met:
    • Blind spot monitor main switch assembly (warning canceling switch assembly) is on with ignition switch ON.
    • The blind spot monitor sensor is not sending voltage to the buzzer but the buzzer receives voltage above a specified level for a specified period of time.
  • Blind spot monitor sensor RH
  • Rear cross traffic alert buzzer (blind spot monitor buzzer)
  • Harness or connector

C1ABE

  • Both of the following conditions are met:
    • Blind spot monitor main switch assembly (warning canceling switch assembly) is on with ignition switch ON.
    • The current flowing to the buzzer is below a specified value when buzzer operation voltage is being sent to the buzzer.
  • Blind spot monitor sensor RH
  • Rear cross traffic alert buzzer (blind spot monitor buzzer)
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot main switch assembly (warning canceling switch assembly) is on.
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK DTC

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

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

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

CHECK HARNESS AND CONNECTOR (REAR CROSS TRAFFIC ALERT BUZZER - BATTERY AND BLIND SPOT MONITOR SENSOR RH)

(a) Disconnect the R37 rear cross traffic alert buzzer (blind spot monitor buzzer) connector.

(b) Disconnect the B13 blind spot monitor sensor RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

R37-2 (BZN) - B13-3 (BUS)

Always

Below 1 Ω

R37-2 (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

R37-1 (BZP) - Body ground

Ignition switch ON

11 to 14 V

R37-1 (BZP) - Body ground

Ignition switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

REPLACE BLIND SPOT MONITOR BUZZER (REAR CROSS TRAFFIC ALERT BUZZER)

(a) Replace the rear cross traffic alert buzzer (blind spot monitor buzzer) with a new or normally functioning one.

  • for Access Cab: for Double Cab:
  • for Double Cab:
NEXT

4.

CHECK DTC

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

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

OK:

No DTCs are output.

OK

END (REAR CROSS TRAFFIC ALERT BUZZER (BLIND SPOT MONITOR BUZZER) WAS DEFECTIVE)

NG

REPLACE BLIND SPOT MONITOR SENSOR RH

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