Lexus NX: Power Source Voltage Malfunction (C1782)
DESCRIPTION
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | Warning Indicate |
|---|---|---|---|---|
| C1782 | Power Source Voltage Malfunction | While the power switch is on (IG), the voltage at terminal B is 10 V or less, or 16 V or higher for 0.5 seconds. |
| Does not come on |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
-
Before replacing the absorber control ECU, perform all of the following again: 1) symptom simulation
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; 2) DTC inspection ; and 3) Techstream inspection (ECU Data List or Active Test ). If no malfunctions are found in other areas, replace the absorber control ECU.
-
When the absorber control ECU is replaced, switch to test mode and check that all test mode DTCs are cleared when their respective deletion conditions are met.
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- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
| 1. | READ VALUE USING TECHSTREAM (IG POWER SOURCE VOLTAGE) |
(a) Turn the power switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / Air suspension / Data List.
Chassis > Air suspension > Data List| Tester Display | Measurement Item | Range | Normal Condition | Diagnostic Note |
|---|---|---|---|---|
| IG Power Source Voltage | ECU power supply voltage | Min.: 0.0 V Max.: 25.5 V | 11 to 14 V (Actual ECU power supply voltage): Power switch on (IG) | - |
| Tester Display |
|---|
| IG Power Source Voltage |
OK:
The normal condition value is displayed on the Techstream.
| NG | .gif) | GO TO STEP 3 |
|
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| 2. | CHECK FOR DTC |
(a) Clear the DTCs.
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(b) Turn the power switch off.
(c) Check for DTCs.
Click here
| Result | Proceed to |
|---|---|
| DTC is not output | A |
| DTC is output | B |
| A | | USE SIMULATION METHOD TO CHECK |
| B | | REPLACE ABSORBER CONTROL ECU |
| 3. | INSPECT AUXILIARY BATTERY |
(a) Check the auxiliary battery voltage.
Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
|---|---|---|
| Auxiliary battery | Power switch on (IG) | 11 to 14 V |
| Auxiliary battery | Power switch on (READY) | 11 to 15.5 V |
| NG | | CHECK OR REPLACE CHARGING SYSTEM OR BATTERY |
|
| 4. | CHECK TERMINAL VOLTAGE (IGB) |
(a) Turn the power switch off.
(b) Disconnect the Q22 absorber control ECU connector.
| (c) Measure the voltage according to the value(s) in the table below. Standard Voltage:
|
|
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 5. | CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
(a) Turn the power switch off.
| (b) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | | REPLACE ABSORBER CONTROL ECU |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Work Procedure
WORK PROCEDURE PROCEDURES NECESSARY WHEN ECU OR OTHER PARTS ARE REPLACED Replacement Part Necessary Procedure Effect/Inoperative Function when Necessary Procedures are not Performed Link
*1: w/ SXM System
*2: The vehicle height changes because of suspension or tire replacement *3: w/ Ha
Components
COMPONENTS ILLUSTRATION *1 DECK FLOOR BOX LH *2 NO. 3 DECK BOARD SUB-ASSEMBLY *3 REAR DECK FLOOR BOX *4 NEGATIVE AUXILIARY BATTERY TERMINAL N*m (kgf*cm, ft.*lbf): Specified torque - - ILLUSTRATION *1 PARKING BRAKE ACTUATOR ASSEMBLY LH *2 REAR DISC BRAKE CY
