DESCRIPTION
The electrical key and TPMS receiver assembly is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assembly operation by identifying a key code based on the radio waves received via the electrical key and TPMS receiver assembly. The electrical key and TPMS receiver assembly receives a signal from the electrical key transmitter sub-assembly and sends signals to the main body ECU (multiplex network body ECU) through the certification ECU (smart key ECU assembly). (ex. If a door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU (multiplex network body ECU)).
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
B1242 |
Wireless Door Lock Tuner Circuit Malfunction |
|
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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PROCEDURE
1. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
(a) Disconnect the M23 electrical key and TPMS receiver assembly connector.
*a |
Component with harness connected (Certification ECU (Smart Key ECU Assembly)) |
- |
- |
(b) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
M67-19 (RDAM) - F1-18 (E) |
Engine switch off |
11 to 14 V |
M67-18 (RCO) - F1-18 (E) |
always |
Below 1 V → 4.5 to 5.5 V pulse generation at regular intervals |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F1-18 (E) - Body ground |
Always |
Below 1 Ω |
OK | ![]() |
REPLACE ELECTRICAL KEY AND TPMS RECEIVER ASSEMBLY
|
|
2. |
CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY AND TPMS RECEIVER ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)) |
(a) Disconnect the F1 and M67 certification ECU (smart key ECU assembly) connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
M67-19 (RDAM) - M23-2 (DATA) |
Always |
Below 1 Ω |
M67-18 (RCO) - M23-8 (+5) |
Always |
Below 1 Ω |
M23-12 (GND) - Body ground |
Always |
Below 1 Ω |
M23-2 (DATA) or M67-19 (RDAM) - Body ground |
Always |
10 kΩ or higher |
M23-8 (+5) or M67-18 (RCO) - Body ground |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Toyota CH-R Service Manual > Occupant Classification System: Fail-safe Chart
FAIL-SAFE CHART
FAIL-SAFE FUNCTION
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Toyota CH-R Service Manual > Combination Meter: Disassembly
DISASSEMBLY
CAUTION / NOTICE / HINT
NOTICE:
When removing and installing the combination meter glass, make sure
not to touch the display panel.
Do not allow any dirt (fingerprints, grease, etc.) to adhere to the
combination meter glass. If the glass is dirty, wipe it clean wit ...