- Front ultrasonic sensor circuit
- Parking assist ECU
| Last Modified: 11-27-2007 | 1.6 C | |
| Service Category: Audio/Visual/Telematics | Section: Park Assist/Monitoring | |
| Model Year: 2008 | Model: LX570 | Doc ID: RM000003AHC002X |
| Title: PARK ASSIST / MONITORING: INTUITIVE PARKING ASSIST SYSTEM: DESCRIPTION (2008 LX570) | ||
|
DTC |
C1AEC |
Front Sensor Communication Malfunction |
DESCRIPTION
This DTC is stored when there is an open or short circuit in the communication line between the front sensors and the ECU, or when there is a malfunction in a front sensor.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1AEC |
An open or short circuit in the communication line between the front sensors and ECU or a malfunction in a front sensor during initialization mode after the engine switch is turned on (IG). |
|
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
|
1. |
CHECK FOR DTC |
(a) Clear the DTCs
.
(b) Check for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output |
A |
|
No DTC is output |
B |
|
|
2. |
CHECK PARKING ASSIST ECU |
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F37-31 (BOF) - Body ground |
Engine switch on (IG) |
7.2 to 8.8 V |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
F37-32 (E1) - Body ground |
Always |
Below 1 Ω |
|
|
3. |
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR LH - PARKING ASSIST ECU) |
(a) Disconnect the B4 sensor connector.
(b) Disconnect the F37 ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-1 (BI) - F37-31 (BOF) |
Always |
Below 1 Ω |
|
B4-3 (SI) - F37-33 (SOF) |
Always |
Below 1 Ω |
|
B4-5 (EI) - F37-32 (E1) |
Always |
Below 1 Ω |
|
B4-1 (BI) - Body ground |
Always |
10 kΩ or higher |
|
B4-3 (SI) - Body ground |
Always |
10 kΩ or higher |
|
B4-5 (EI) - Body ground |
Always |
10 kΩ or higher |
|
|
4. |
CHECK HARNESS AND CONNECTOR (NO. 1 ULTRASONIC SENSOR LH - NO. 1 ULTRASONIC SENSOR RH) |
(a) Disconnect the B4 and B3 sensor connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-2 (BO) - B3-1 (BI) |
Always |
Below 1 Ω |
|
B4-4 (SO) - B3-3 (SI) |
Always |
Below 1 Ω |
|
B4-6 (EO) - B3-5 (EI) |
Always |
Below 1 Ω |
|
B4-2 (BO) - Body ground |
Always |
10 kΩ or higher |
|
B4-4 (SO) - Body ground |
Always |
10 kΩ or higher |
|
B4-6 (EO) - Body ground |
Always |
10 kΩ or higher |
|
|
5. |
CHECK FOR DTC |
(a) Clear the DTCs
.
(b) Check for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output and multi-information display indicates open circuit (front left and front right) |
A |
|
No DTC is output |
B |
|
|
6. |
INSPECT NO. 1 ULTRASONIC SENSOR LH |
|
(a) Disconnect the B4 sensor connector. |
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
B4-1 (BI) - B4-5 (BI) |
Always |
10 kΩ or higher |
|
B4-1 (BI) - B4-2 (BO) |
Always |
10 kΩ or higher |
|
B4-3 (SI) - B4-4 (SO) |
Always |
Below 1 Ω |
|
B4-5 (EI) - B4-6 (EO) |
Always |
Below 1 Ω |
|
|
7. |
CHECK FOR DTC |
(a) Clear the DTCs
.
(b) Check for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output |
A |
|
No DTC is output |
B |
|
|
8. |
REPLACE NO. 1 ULTRASONIC SENSOR RH |
(a) Replace the No. 1 ultrasonic sensor RH with a normally functioning sensor
.
|
|
9. |
CHECK FOR DTC |
(a) Clear the DTCs
.
(b) Check for DTCs
.
Result
|
Result |
Proceed to |
|---|---|
|
DTC C1AEC is output |
A |
|
No DTC is output |
B |
|
|
|