Toyota 4Runner: Manual Button Malfunction (B15C5)

Toyota 4Runner Service Manual / Audio / Visual / Telematics / Cellular Communication / Safety Connect System / Manual Button Malfunction (B15C5)

DESCRIPTION

This DTC is stored when the DCM (Telematics Transceiver) detects an open or short circuit in the manual (SOS) switch.

DTC Code	DTC Detection Condition	Trouble Area
B15C5	An open or short circuit in the manual (SOS) switch is detected.	DCM (Telematics Transceiver) Map light assembly Harness or connector

WIRING DIAGRAM

PROCEDURE

1.	READ VALUE USING TECHSTREAM (MANUAL [SOS] SWITCH OPERATION)

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Enter the following menus: Body Electrical / Telematics / Data List.

(e) Check that the manual (SOS) switch condition displayed on the Techstream changes according to the manual (SOS) switch operation.

Telematics

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
Emergency Switch	Manual (SOS) switch / OFF or ON	OFF: Manual (SOS) switch not pressed	-
Emergency Switch	Manual (SOS) switch / OFF or ON	ON: Manual (SOS) switch pressed	-

Result

Result	Proceed to
Techstream display changes when turning manual (SOS) switch ON/OFF	A
Techstream display does not change when turning manual (SOS) switch ON/OFF	B

GO TO STEP 3

2.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver) (See page ).

NOTICE:

The ignition switch must be off.
Do not replace the DCM (Telematics Transceiver) with one from another vehicle.

PERFORM DCM ACTIVATION

3.	CHECK DCM (TELEMATICS TRANSCEIVER) (SIG1 VOLTAGE)

(a) Remove the DCM (Telematics Transceiver) with the connector connected (See page ).

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F39-27 (SIG1) - F39-26 (SIG-)	Ignition switch ON, manual (SOS) switch not pressed	1.5 to 2.0 V

Text in Illustration

*a	Component with harness connected (DCM [Telematics Transceiver])

GO TO STEP 5

4.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver) (See page ).

NOTICE:

The ignition switch must be off.
Do not replace the DCM (Telematics Transceiver) with one from another vehicle.

PERFORM DCM ACTIVATION

5.	INSPECT MAP LIGHT ASSEMBLY (MANUAL [SOS] SWITCH)

(a) Remove the map light assembly (See page ).

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
20 (SIG2) - 16 (GND)	Manual (SOS) switch not pressed	410 to 414 Ω
20 (SIG2) - 16 (GND)	Manual (SOS) switch pressed	81 to 83 Ω

Text in Illustration

*a	Component without harness connected (Map Light Assembly)

REPLACE MAP LIGHT ASSEMBLY

6.	CHECK HARNESS AND CONNECTOR (DCM - MAP LIGHT ASSEMBLY)

(a) Disconnect the F39 DCM (Telematics Transceiver) connector.

(b) Disconnect the U2 map light assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F39-27 (SIG1) - U2-20 (SIG2)	Always	Below 1 Ω
F39-26 (SIG-) - U2-16 (GND)	Always	Below 1 Ω
F39-27 (SIG1) - Body ground	Always	10 kΩ or higher
F39-26 (SIG-) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to DCM [Telematics Transceiver])

Front view of wire harness connector

(to Map Light Assembly)

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver) (See page ).

NOTICE:

The ignition switch must be off.
Do not replace the DCM (Telematics Transceiver) with one from another vehicle.

PERFORM DCM ACTIVATION

Backup Battery Failure (B15CC)

DESCRIPTION This DTC is stored when the DCM (Telematics Transceiver) detects one of the following: Open or short in the BUB (Back-Up Battery) circuit. The BUB (Back-Up Battery) voltage dr ...

Telematics Transceiver Malfunction (B15A8)

DESCRIPTION This DTC is stored when an error in EEPROM or PLL IC is detected during the DCM (Telematics Transceiver) self-check. The EEPROM (Electrically Erasable Programmable Read-Only Memory) s ...

Other materials about Toyota 4Runner:

Installation
INSTALLATION CAUTION / NOTICE / HINT CAUTION: Wear protective gloves. Sharp areas on the parts may injure your hands. HINT: A bolt without a torque specification is shown in the standard bolt chart (See page ). PROCEDURE 1. INSTALL REAR SEAT CUSHION ...

SFR Solenoid Circuit (C0226,C0236,C0246,C0256,C1225-C1228)
DESCRIPTION The solenoid turns on when signals are received from the skid control ECU and controls the pressure acting on the wheel cylinders, thus controlling braking force. DTC Code DTC Detection Condition Trouble Area ...