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 No. |
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
PROCEDURE
1. |
CHECK DTC OUTPUT (C1AEC) |
(a) Check for DTCs (See page ).
(b) Clear the DTCs (See page ).
(c) Recheck for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC C1AEC is output |
A |
No DTCs are output |
B |
B | ![]() |
USE SIMULATION METHOD TO CHECK |
|
2. |
CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - FRONT LEFT SENSOR) |
(a) Disconnect the D79 clearance warning ECU assembly connector.
(b) Disconnect the A54 No. 1 ultrasonic sensor connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
D79-4 (BOF) - A54-1 (BI) |
Always |
Below 1 Ω |
D79-8 (SOF) - A54-3 (SI) |
Always |
Below 1 Ω |
D79-6 (E5) - A54-5 (EI) |
Always |
Below 1 Ω |
D79-4 (BOF) - Body ground |
Always |
10 kΩ or higher |
D79-8 (SOF) - Body ground |
Always |
10 kΩ or higher |
D79-6 (E5) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
CHECK HARNESS AND CONNECTOR (FRONT LEFT SENSOR - FRONT RIGHT SENSOR) |
(a) Disconnect the A55 No. 1 ultrasonic sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
A54-2 (BO) - A55-1 (BI) |
Always |
Below 1 Ω |
A54-4 (SO) - A55-3 (SI) |
Always |
Below 1 Ω |
A54-6 (EO) - A55-5 (EI) |
Always |
Below 1 Ω |
A54-2 (BO) - Body ground |
Always |
10 kΩ or higher |
A54-4 (SO) - Body ground |
Always |
10 kΩ or higher |
A54-6 (EO) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
INSPECT NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
NG | ![]() |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
|
5. |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT LEFT SENSOR) |
|
6. |
CHECK DTC OUTPUT (C1AEC) |
(a) Clear the DTCs (See page ).
(b) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC C1AEC is output |
A |
No DTCs are output |
B |
B | ![]() |
END |
|
7. |
REPLACE NO. 1 ULTRASONIC SENSOR (FRONT RIGHT SENSOR) |
|
8. |
CHECK DTC OUTPUT (C1AEC) |
(a) Clear the DTCs (See page ).
(b) Check for DTCs (See page ).
Result |
Proceed to |
---|---|
DTC C1AEC is output |
A |
No DTCs are output |
B |
A | ![]() |
REPLACE CLEARANCE WARNING ECU ASSEMBLY |
B | ![]() |
END |
On-vehicle Inspection
ON-VEHICLE INSPECTION
PROCEDURE
1. INSPECT CENTER AIRBAG SENSOR ASSEMBLY (VEHICLE NOT INVOLVED IN COLLISION)
(a) Perform a diagnostic system check (See page
).
2. INSPECT CENTER AIRBAG SENSOR ASSEMBLY (VEHICLE INVOLVED IN COLLISION AND AIRBAG
HAS NOT D ...
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Components
COMPONENTS
ILLUSTRATION
Removal
REMOVAL
PROCEDURE
1. REMOVE SPIRAL CABLE WITH SENSOR SUB-ASSEMBLY
(See page )
2. REMOVE WINDSHIELD WIPER SWITCH ASSEMBLY
3. REMOVE HEADLIGHT DIMMER SWITCH ASSEMBLY
(a) Disconnect the con ...
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