| Last Modified: 05-13-2024 | 6.11:8.1.0 | Doc ID: RM100000001LF5L |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [09/2019 - 04/2020] |
| Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Sedan, Gasoline Model): B1571; Manual (SOS) Switch Green Indicator Malfunction; 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020] | ||
|
DTC |
B1571 |
Manual (SOS) Switch Green Indicator Malfunction |
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 engine switch is turned on (IG).
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 engine switch is on (IG). |
|
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
![2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Sedan, Gasoline Model): HEALTH CHECK](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK DTC |
(a) Turn the engine switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the engine switch on (IG) 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 |
|
|
|
2. |
INSPECT MAP LIGHT ASSEMBLY (GREEN INDICATOR) |
|
(a) Disconnect the T6 map light assembly connector. |
|
(b) Connect 2 dry-cell batteries (1.5 V each) in series.
(c) Connect the positive (+) lead to terminal 19 (IND2) and the negative (-) lead to terminal 12 (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 |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY) |
(a) Disconnect the I72 DCM (Telematics Transceiver) connector.
(b) Disconnect the T6 map light assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I72-26 (SIG-) - T6-12 (GND3) |
Always |
Below 1 Ω |
|
I72-26 (SIG-) or T6-12 (GND3) - Body ground |
Always |
10 kΩ or higher |
|
I72-12 (IND2) - T6-19 (IND2) |
Always |
Below 1 Ω |
|
I72-12 (IND2) or T6-19 (IND2) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (Telematics Transceiver).
Click here
NOTICE:
- The engine switch must be off.
- Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
| NEXT |
|
|
5. |
CHECK MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH GREEN INDICATOR CONDITION) |
(a) Confirm the green indicator status after the engine switch is turned on (IG).
Click here
|
Result |
Proceed to |
|---|---|
|
Green indicator remains off |
A |
|
Green indicator remains on |
B |
| B |
|
|
|
6. |
INSPECT MAP LIGHT ASSEMBLY (GREEN INDICATOR INPUT VOLTAGE) |
|
(a) Remove the map light assembly but do not disconnect the connectors. Click here
|
|
(b) Connect the positive lead of a voltmeter to terminal T6-19 (IND2), and the negative lead to terminal T6-12 (GND3).
(c) Measure the voltage.
Standard:
1.0 to 8.5 V for 2 seconds after the engine switch is turned on (IG) and red indicator has turned off.
0 V when the engine switch is off.
| OK |
|
|
|
7. |
INSPECT DCM (TELEMATICS TRANSCEIVER) (GREEN INDICATOR OUTPUT VOLTAGE) |
|
(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors. Click here
|
|
(b) Connect the positive lead of a voltmeter to terminal I72-12 (IND2), and the negative lead to body ground.
(c) Measure the voltage.
Standard:
1.0 to 8.5 V for 2 seconds after the engine switch is turned on (IG) and red indicator has turned off.
0 V when the engine switch is off.
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - BODY GROUND) |
|
(a) Remove the DCM (Telematics Transceiver) but do not disconnect the connectors. Click here
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I72-12 (IND2) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
9. |
REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (Telematics Transceiver).
Click here
NOTICE:
- The engine switch must be off.
- Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
| NEXT |
|
|
10. |
REPLACE DCM (TELEMATICS TRANSCEIVER) |
(a) Replace the DCM (Telematics Transceiver).
Click here
NOTICE:
- The engine switch must be off.
- Do not swap the DCM (Telematics Transceiver) with one from another vehicle.
| NEXT |
|
|
|