DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (IG VOLTAGE)
RECONFIRM DTC OUTPUT
READ VALUE USING INTELLIGENT TESTER (+B POWER SOURCE VOLTAGE, +B2 POWER SOURCE VOLTAGE)
INSPECT FUSE (AHC-B, AHC-B NO. 2)
CHECK HARNESS AND CONNECTOR (BATTERY - SUSPENSION CONTROL ECU)
CHECK HARNESS AND CONNECTOR (BATTERY - ECU AND BODY GROUND)
DTC C1782 Power Source Voltage Malfunction
DESCRIPTION
| DTC Code | Detection Condition | Trouble Area |
| C1782 | While the engine switch is on (IG), voltage at terminal IG, BAT and/or BAT2 is 10 V or less, or 16 V or more for 0.5 seconds. | Battery
Charging system
Harness or connector
AHC-B fuse
AHC-B No. 2 fuse
Suspension control ECU
|
WIRING DIAGRAM
INSPECTION PROCEDURE
Even if DTC C1781 is stored at the same time, perform the inspection for DTC C1782 first.
Before performing troubleshooting, inspect the connectors of related circuits.
If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed ().
| 1.READ VALUE USING INTELLIGENT TESTER (IG VOLTAGE) |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and the tester on.
Read the "IG Power Source Voltage" item in the Data List.
AHC| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| IG Power Source Voltage | Power supply voltage /
min.: 0 V
max.: 255 V | Engine switch on (IG): 11 to 14 V | - |
Check for DTCs.
Result| Result | Proceed to |
| DTC is output | A |
| DTC is not output | B |
| | USE SIMULATION METHOD TO CHECK ()
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| 3.READ VALUE USING INTELLIGENT TESTER (+B POWER SOURCE VOLTAGE, +B2 POWER SOURCE VOLTAGE) |
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and the tester on.
Read the "+B Power Source Voltage" and "+B2 Power Source Voltage" items in the Data List.
AHC| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| +B Power Source Voltage | Power supply for absorber control actuator /
min.: 0 V
max.: 255 V | Engine switch on (IG): 11 to 14 V | - |
| +B2 Power Source Voltage | Power supply for No. 1 height control valve and front suspension control valve /
min.: 0 V
max.: 255 V | Engine switch on (IG): 11 to 14 V | - |
| OK | |
| |
| REPLACE SUSPENSION CONTROL ECU ()
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| 4.INSPECT FUSE (AHC-B, AHC-B NO. 2) |
Remove the AHC-B and AHC-B No. 2 fuses from the cowl side junction block RH.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| AHC-B fuse | Always | Below 1 Ω |
| AHC-B No. 2 fuse | Always | Below 1 Ω |
| | CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE |
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| 5.CHECK HARNESS AND CONNECTOR (BATTERY - SUSPENSION CONTROL ECU) |
Disconnect the K34 and K35 ECU connectors.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| K34-3 (BAT2) - Body ground | Engine switch on (IG) | 11 to 14 V |
| K35-1 (BAT) - Body ground | Engine switch on (IG) | 11 to 14 V |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
| |
| REPLACE SUSPENSION CONTROL ECU ()
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| 6.CHECK HARNESS AND CONNECTOR (BATTERY - ECU AND BODY GROUND) |
Disconnect the K34 ECU connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| K34-5 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
Result| Result | Proceed to |
| OK | A |
| NG (1UR-FE) | B |
| NG (1VD-FTV) | C |
| | BATTERY VOLTAGE IS LOW OR CHARGING SYSTEM HAS MALFUNCTION |
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| | BATTERY VOLTAGE IS LOW OR CHARGING SYSTEM HAS MALFUNCTION |
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| A | |
| |
| REPLACE SUSPENSION CONTROL ECU ()
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