DESCRIPTION
If the radio and display receiver assembly cannot detect the navigation ECU for a certain period of time (90 seconds) after the engine switch is turned on (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
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
CHECK MAP SCREEN |
(a) Turn the engine switch on (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:
A | ![]() |
USE SIMULATION METHOD TO CHECK |
|
2. |
CHECK DTC |
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs(b) Turn the engine switch off.
(c) Turn the engine switch on (IG) and wait for 90 seconds.
(d) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble CodesOK:
No DTCs are output.
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
|
3. |
CHECK HARNESS AND CONNECTOR (NAVIGATION ECU - BATTERY AND BODY GROUND) |
(a) Disconnect the navigation ECU connector. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F135-23 (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 |
---|---|---|
F135-10 (+B) - Body ground |
Always |
11 to 14 V |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
INSPECT NO. 1 NAVIGATION WIRE |
*a |
Front view of wire harness connector (to Navigation ECU) |
*b |
Front view of wire harness connector (to Antenna Cord Sub-assembly) |
(a) Disconnect the UA No. 1 navigation wire connector from the antenna cord sub-assembly.
(b) Disconnect the GU No. 1 navigation wire connector from the navigation ECU.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
GU-4 (USB+) - UA-1 |
Always |
Below 1 Ω |
GU-5 (USB-) - UA-2 |
Always |
Below 1 Ω |
GU-6 (USBG) - UA-3 |
Always |
Below 1 Ω |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
REPLACE ANTENNA CORD SUB-ASSEMBLY |
(a) Replace the antenna cord sub-assembly with a new or known good one.
Click here
|
6. |
CHECK DTC |
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs(b) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble CodesOK:
No DTCs are output.
OK | ![]() |
END (ANTENNA CORD SUB-ASSEMBLY IS DEFECTIVE) |
|
7. |
REPLACE NAVIGATION ECU |
(a) Replace the navigation ECU with a new one.
Click here
|
8. |
CHECK DTC |
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs(b) Turn the engine switch off.
(c) Turn the engine switch on (IG) and wait for 90 seconds.
(d) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble CodesOK:
No DTCs are output.
OK | ![]() |
END (NAVIGATION ECU IS DEFECTIVE) |
NG | ![]() |
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
Toyota CH-R Owners Manual > For safe use: Before driving
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Toyota CH-R Service Manual > Front Door Speaker: Removal
REMOVAL
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE
1. REMOVE FRONT DOOR INSIDE HANDLE BEZEL PLUG
Click here
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