Toyota CH-R Service Manual: Manual (SOS) Switch Green Indicator Malfunction (B1571)

DESCRIPTION

This DTC is set when the DCM (Telematics Transceiver) detects an open or short in the manual (SOS) switch green indicator circuit of the manual (SOS) switch. The manual (SOS) switch green indicator illuminates after the ignition switch turned to ON.

If the safety connect system is not active, the manual (SOS) switch green indicator will turn off.

If the safety connect system is active, the manual (SOS) switch green indicator will blink while communicating with the call center.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
B1571	Manual (SOS) Switch Green Indicator Malfunction	Current for manual (SOS) switch green indicator reaches malfunction criteria for 10 seconds when ignition switch is ON.	Mayday switch assembly (manual (SOS) switch) Map light assembly Wire harness or connector DCM (Telematics Transceiver)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

Before performing this diagnostic procedure, make sure to perform Health Check and confirm that the DCM/VIN registration information is correct.

Click here

PROCEDURE

1.

CHECK DTC

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch ON and wait for 10 seconds.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Recheck for DTCs.

Body Electrical > Telematics > Trouble Codes

Result	Proceed to
DTC B1570, B1571 and B15C5 are output	A
DTC B1571 is output (DTC B1570 and B15C5 are not output)	B

B

GO TO STEP 6

A

2.	INSPECT MAP LIGHT ASSEMBLY (GREEN INDICATOR)

(a) Disconnect the R4 map light assembly connector.

*a Component without harness connected (Map Light Assembly)

(b) Connect 2 dry-cell batteries (1.5 V each) in series.

(c) Connect the positive (+) lead to terminal 5 (IND2) and the negative (-) lead to terminal 1 (GND3) of the map light assembly connector.

(d) Check if the illumination for the manual (SOS) switch green indicator comes on.

OK:

Green indicator comes on.

NG

GO TO STEP 5

OK

3.	CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY)

(a) Disconnect the F134 DCM (Telematics Transceiver) connector.

(b) Disconnect the R4 map light assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F134-26 (SIG-) - R4-1 (GND3)	Always	Below 1 Ω
F134-26 (SIG-) or R4-1 (GND3) - Body ground	Always	10 kΩ or higher
F134-12 (IND2) - R4-5 (IND2)	Always	Below 1 Ω
F134-12 (IND2) or R4-5 (IND2) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NEXT

PERFORM DCM ACTIVATION

5.	INSPECT MAYDAY SWITCH ASSEMBLY (MANUAL (SOS) SWITCH) (GREEN INDICATOR)

(a) Remove the mayday switch assembly (manual (SOS) switch).

Click here

(b) Inspect the mayday switch assembly (manual (SOS) switch).

Click here

OK

REPLACE MAP LIGHT ASSEMBLY

NG

REPLACE MAYDAY SWITCH ASSEMBLY (MANUAL (SOS) SWITCH)

6.	CHECK MAYDAY SWITCH ASSEMBLY (MANUAL (SOS) SWITCH GREEN INDICATOR CONDITION)

(a) Confirm the green indicator status after the ignition switch turned to ON.

Click here

Result	Proceed to
Green indicator remains off	A
Green indicator remains on	B

B

GO TO STEP 12

A

7.	INSPECT MAP LIGHT ASSEMBLY (GREEN INDICATOR INPUT VOLTAGE)

(a) Remove the map light assembly but do not disconnect the connectors. Click here

*a Component with harness connected (Map Light Assembly)

(b) Connect the positive lead of a voltmeter to terminal R4-5 (IND2), and the negative lead to terminal R4-1 (GND3).

(c) Measure the voltage.

Standard:

1.0 to 8.5 V for 2 seconds after the ignition switch turned to ON and red indicator has turned off.

0 V when the ignition switch is off.

NG

GO TO STEP 9

OK

8.	INSPECT MAYDAY SWITCH ASSEMBLY (MANUAL (SOS) SWITCH) (GREEN INDICATOR)

(a) Remove the mayday switch assembly (manual (SOS) switch).

Click here

(b) Inspect the mayday switch assembly (manual (SOS) switch).

Click here

OK

REPLACE MAP LIGHT ASSEMBLY

NG

REPLACE MAYDAY SWITCH ASSEMBLY (MANUAL (SOS) SWITCH)

9.	INSPECT DCM (TELEMATICS TRANSCEIVER) (GREEN INDICATOR OUTPUT VOLTAGE)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors. Click here

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

(b) Connect the positive lead of a voltmeter to terminal F134-12 (IND2), and the negative lead to body ground.

(c) Measure the voltage.

Standard:

1.0 to 8.5 V for 2 seconds after the ignition switch turned to ON and red indicator has turned off.

0 V when the ignition switch is off.

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR

NG

10.	CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - BODY GROUND)

(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors. Click here

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F134-12 (IND2) - Body ground	Always	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

11.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NEXT

PERFORM DCM ACTIVATION

12.	REPLACE DCM (TELEMATICS TRANSCEIVER)

(a) Replace the DCM (Telematics Transceiver).

Click here

NEXT

PERFORM DCM ACTIVATION