Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001O4FK
Model Year Start: 2021 Model: GR Corolla Prod Date Range: [04/2020 - 09/2022]
Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): B15C511,B15C513; Emergency Call Switch Circuit Short to Ground; 2021 - 2022 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 09/2022]

DTC

B15C511

Emergency Call Switch Circuit Short to Ground

DTC

B15C513

Emergency Call Switch Circuit Open

DESCRIPTION

If the DCM (telematics transceiver) detects an error in the communication between the DCM (telematics transceiver) and the map light assembly (manual (SOS) switch) as a result of the DCM (telematics transceiver) self check, this DTC will be stored.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B15C511

Emergency Call Switch Circuit Short to Ground

Manual (SOS) switch impedance (Ω) is lower than the malfunction threshold for 10 seconds or more when the engine switch is on (IG)
  • Map light assembly (manual (SOS) switch)
  • Harness or connector
  • DCM (telematics transceiver)

B15C513

Emergency Call Switch Circuit Open

Manual (SOS) switch impedance (Ω) is higher than the malfunction threshold for 10 seconds or more when the engine switch is on (IG)
  • Map light assembly (manual (SOS) switch)
  • Harness or connector
  • DCM (telematics transceiver)

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Safety Connect System.

Click here 2021 - 2022 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 09/2022]; CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Gasoline Model): PRECAUTION

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 or more.

(d) Turn the Techstream on.

(e) Clear the DTCs.

Body Electrical > Telematics > Clear DTCs

(f) Check for DTCs and check that no DTCs are output.

Body Electrical > Telematics > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

2.

INSPECT MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH)

(a) Remove the map light assembly (manual (SOS) switch).

Click here 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): PERSONAL LIGHT: REMOVAL

*a

Component without harness connected

(Map Light Assembly (Manual (SOS) Switch))

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

18 (SIG1) - 12 (GND3)

Manual (SOS) switch not operated

410 to 414 Ω

18 (SIG1) - 12 (GND3)

Manual (SOS) switch operated

81 to 83 Ω
NG

REPLACE MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH)

OK

3.

CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) - MAP LIGHT ASSEMBLY (MANUAL (SOS) SWITCH))

(a) Disconnect the I143 DCM (telematics transceiver) connector.

(b) Disconnect the T6 map light assembly (manual (SOS) switch) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I143-21 (SIG1) - T6-18 (SIG1)

Always

Below 1 Ω

I143-3 (SIG-) - T6-12 (GND3)

Always

Below 1 Ω

I143-21 (SIG1) or T6-18 (SIG1) - Body ground

Always

10 kΩ or higher

I143-3 (SIG-) or T6-12 (GND3) - 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) with a new one.

Click here 2021 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [04/2020 - 09/2022]; CELLULAR COMMUNICATION: DCM(TELEMATICS TRANSCEIVER): REMOVAL

NOTICE:

  • The engine switch must be off.
  • Do not exchange the DCM (telematics transceiver) with one from another vehicle.
NEXT

PERFORM DCM ACTIVATION