Lexus NX: Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor (C1381)
DESCRIPTION
This DTC is stored when the skid control ECU (brake booster with master cylinder assembly) receives a sensor supply voltage malfunction signal from the yaw rate and acceleration sensor (airbag ECU assembly). This DTC may also be stored due to a temporary power source voltage drop.
| DTC No. | Detection Item | INF Code | DTC Detection Condition | Trouble Area | Note |
|---|---|---|---|---|---|
| C1381 | Abnormal Power Supply Voltage in Yaw Rate and/or Deceleration Sensor | 601 | While acceleration sensor communication is enabled, a supply voltage malfunction signal is received from the sensor for 10 seconds. |
| - |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
-
When replacing the yaw rate and acceleration sensor (airbag ECU assembly), perform zero point calibration.
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- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
| 1. | CHECK HARNESS AND CONNECTOR (IG2 TERMINAL) |
NOTICE:
-
After the power switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.
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-
When disconnecting and reconnecting the auxiliary battery
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HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.
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(a) Turn the power switch off.
(b) Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
| (c) Make sure that there is no looseness at the locking part and the connecting part of the connector. |
|
(d) Disconnect the I58 yaw rate and acceleration sensor (airbag ECU assembly) connector.
(e) Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
(f) Turn the power switch on (IG).
(g) Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).
(h) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| I58-21 (IG2) - Body ground | Power switch on (IG) | 11 to 14 V |
| NG | .gif) | REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 CIRCUIT) |
|
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| 2. | CHECK HARNESS AND CONNECTOR (E TERMINAL) |
| (a) Turn the power switch off. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| I58-25 (E1) - Body ground | Always | Below 1 Ω |
| I58-26 (E2) - Body ground | Always | Below 1 Ω |
NOTICE:
Check the yaw rate and acceleration sensor signal after replacement.
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HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.
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| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (E CIRCUIT) |
|
| 3. | RECONFIRM DTC |
(a) Reconnect the I58 yaw rate and acceleration sensor (airbag ECU assembly) connector.
(b) Clear the DTC.
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(c) Turn the power switch off.
(d) Turn the power switch on (READY).
(e) Perform a road test.
(f) Check if the same DTC is recorded.
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| Result | Proceed to |
|---|---|
| DTC C1381 is not output | A |
| DTC C1381 is output | B |
NOTICE:
Check the yaw rate and acceleration sensor signal after replacement.
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HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step.
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| A | | USE SIMULATION METHOD TO CHECK |
| B | | REPLACE AIRBAG ECU ASSEMBLY |
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