| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001LF5J |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [09/2019 - 04/2020] |
| Title: CELLULAR COMMUNICATION: SAFETY CONNECT SYSTEM (for Sedan, Gasoline Model): B1536,B1537; Short in Telephone SUB Antenna Circuit; 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020] | ||
|
DTC |
B1536 |
Short in Telephone SUB Antenna Circuit |
|
DTC |
B1537 |
Open in Telephone SUB Antenna Circuit |
DESCRIPTION
These DTCs are stored when the DCM (Telematics Transceiver) detects an open or a short in the telephone and GPS antenna assembly (for Front Side) circuit. The DCM (Telematics Transceiver) oscillates and receives 824 - 894 MHz or 1850 - 1990 MHz radio-frequency through the telephone and GPS antenna assembly (for Front Side).
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B1536 |
Short in Telephone SUB Antenna Circuit |
Telephone and GPS antenna assembly (for Front Side) impedance is lower than malfunction criterion for 10 seconds when engine switch is on (IG). (Short circuit) |
|
|
B1537 |
Open in Telephone SUB Antenna Circuit |
Telephone and GPS antenna assembly (for Front Side) impedance is higher than malfunction criterion for 10 seconds when engine switch is on (IG). (Open circuit) |
|
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)
-
Refer to "PARTS LOCATION" for the installation location of telephone and GPS antenna cord.
Click here
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 B1536 or B1537 is output |
A |
|
DTC B1536 or B1537 is not output |
B |
| B |
|
|
|
2. |
INSPECT TELEPHONE AND GPS ANTENNA ASSEMBLY (for Front Side) |
|
(a) Disconnect the telephone and GPS antenna assembly (for Front Side) connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
4 - 4a |
Always |
4 to 11 kΩ |
| NG |
|
|
|
3. |
INSPECT TELEPHONE AND GPS ANTENNA CORD (NO. 2 ANTENNA CORD SUB-ASSEMBLY) |
|
(a) Disconnect the D telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) connector. |
|
|
(b) Disconnect the A telephone and GPS antenna cord (No. 2 antenna cord sub-assembly) connector. |
|
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
D-4 - A-1 |
Always |
Below 1 Ω |
|
D-4 or A-1 - Body ground |
Always |
10 kΩ or higher |
|
D-4a - A-1a |
Always |
Below 1 Ω |
|
D-4a or A-1a - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPLACE TELEPHONE AND GPS ANTENNA CORD (NO. 2 ANTENNA CORD SUB-ASSEMBLY) |
|
|
4. |
REPLACE TELEPHONE AND GPS ANTENNA ASSEMBLY (for Front Side) |
(a) Replace the telephone and GPS antenna assembly (for Front Side) with a known good one and check if the same problem occurs again.
Click here
OK:
The system returns to normal.
| OK |
|
END |
|
|
5. |
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 |
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