| Last Modified: 07-31-2024 | 6.11:8.1.0 | Doc ID: RM100000001HU8U |
| Model Year Start: 2020 | Model: GR Corolla | Prod Date Range: [03/2019 - 11/2022] |
| Title: NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: B1543; Extension Module Disconnected 2; 2020 - 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 11/2022] | ||
|
DTC |
B1543 |
Extension Module Disconnected 2 |
DESCRIPTION
If the radio and display receiver assembly cannot detect the navigation ECU for a certain period of time (90 seconds) after the ignition switch is turned to ACC and the radio and display receiver assembly confirms that the information is missing by checking past navigation ECU recognition information (registered information), this DTC will be stored.
HINT:
The Navigation system uses USB communication between devices. If an open, short, short to +B or short to ground occurs in the USB circuit, communication is interrupted and the Navigation system will not operate normally.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
B1543 |
Extension Module Disconnected 2 |
Navigation ECU disconnected |
|
HINT:
This DTC may be stored due to environmental reasons such as electrical noise or interference.
WIRING DIAGRAM
w/ Manual (SOS) Switch
w/o Manual (SOS) Switch
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 Navigation System.
Click here
![2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: PRECAUTION](/t3Portal/stylegraphics/info.gif)
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
When replacing the radio and display receiver assembly or navigation ECU, always replace it with a new one. If a radio and display receiver assembly or navigation ECU which was installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly or navigation ECU may not operate normally.
PROCEDURE
|
1. |
CHECK MAP SCREEN |
(a) Turn the ignition switch to ACC and wait for 90 seconds.
(b) Press the "MAP" switch and check that the map screen is displayed normally.
|
Result |
Proceed to |
|---|---|
|
Map screen is displayed normally |
A |
|
Map screen is not displayed normally |
B |
HINT:
- This DTC may be stored due to environmental reasons such as electrical noise or interference.
- Clear past DTCs when the map screen is displayed normally. (Codes stored due to past environmental factors)
| A |
|
|
|
2. |
CHECK DTC |
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON and wait for 90 seconds.
(d) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble Codes
OK:
No DTCs are output.
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (w/ Manual (SOS) Switch) |
B |
|
NG (w/o Manual (SOS) Switch) |
C |
| A |
|
| C |
|
|
|
3. |
CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - BATTERY AND BODY GROUND) |
|
(a) Disconnect the I69 navigation ECU connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I69-23 (GND) - Body ground |
Always |
Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I69-10 (+B) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU) |
|
(a) Disconnect the t3 navigation ECU connector. |
|
(b) Disconnect the t5 radio and display receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
t3-4 (US4+) - t5-1 (US4+) |
Always |
Below 1 Ω |
|
t3-5 (US4-) - t5-2 (US4-) |
Always |
Below 1 Ω |
|
t3-6 (UGD4) - t5-3 (UGD4) |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
5. |
REPLACE NAVIGATION ECU |
(a) Replace the navigation ECU with a new one.
Click here
|
|
6. |
CHECK DTC |
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON and wait for 90 seconds.
(d) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble Codes
OK:
No DTCs are output.
| OK |
|
END (NAVIGATION ECU IS DEFECTIVE) |
| NG |
|
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY
|
|
7. |
CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - BATTERY AND BODY GROUND) |
|
(a) Disconnect the I69 navigation ECU connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I69-23 (GND) - Body ground |
Always |
Below 1 Ω |
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
I69-10 (+B) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
8. |
CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY - NAVIGATION ECU) |
|
(a) Disconnect the s1 navigation ECU connector. |
|
(b) Disconnect the s3 radio and display receiver assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
s1-4 (US4+) - s3-1 (US4+) |
Always |
Below 1 Ω |
|
s1-5 (US4-) - s3-2 (US4-) |
Always |
Below 1 Ω |
|
s1-6 (UGD4) - s3-3 (UGD4) |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
9. |
REPLACE NAVIGATION ECU |
(a) Replace the navigation ECU with a new one.
Click here
|
|
10. |
CHECK DTC |
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON and wait for 90 seconds.
(d) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble Codes
OK:
No DTCs are output.
| OK |
|
END (NAVIGATION ECU IS DEFECTIVE) |
| NG |
|
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY
|
|
|