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

Toyota Tacoma 2015-2018 Service Manual / Park Assist / Monitoring / Blind Spot Monitor System / 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

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

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.

USE SIMULATION METHOD TO CHECK

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.

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

REPAIR OR REPLACE HARNESS OR CONNECTOR

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:

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.

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

REPLACE BLIND SPOT MONITOR SENSOR RH

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