4E-21 ABS:
DTC C1057: Power Source Circuit
S7RS0B4504014
Wiring Diagram
DTC Detecting Condition
The ABS control module monitors the power source voltage at terminal “E03-14”. When the power source voltage
becomes extremely high or low while vehicle is running at more than 20 km/h (13 MPH), this DTC will be set. As soon
as the power source voltage becomes normal, the ABS warning light will be turned off and the ABS control module will
return to normal operation, but the set DTC will be remain.
DTC Troubleshooting
[A]: ABS hydraulic unit / control module connector
(viewed from terminal side)
2. Main fuse box
1. Battery 3. ABS hydraulic unit / control module assembly
E03-14
WHT/BLU
1
2
3
BLK
BLK
E03-13
E03-26
[A]
E03
15
16
17
18
19
20
21
22
23
24
25
2
3
4
5
6
7
8
9
10
11
12
1
13
14
26
12V
I6RS0C450011-01
Step Action Yes No
1 Was “ABS Check” performed? Go to Step 2. Go to “ABS Check”.
2 1) Disconnect ABS hydraulic unit / control module
connector with ignition switch turned OFF.
2) Check for proper connection to ABS hydraulic unit /
control module connector at terminals “E03-14” and
“E03-13”.
3) If OK, then turn ignition switch to ON position and
measure voltage between terminals “E03-14” and “E03-
13”.
Is voltage 9.7
±
0.3 V or more?
Go to Step 5. Go to Step 3.
3 1) Turn ignition switch to OFF.
2) Check for proper connection to ABS hydraulic unit /
control module connector at terminals “E03-13” and
“E03-26”.
3) If OK then turn ignition switch to ON and measure
resistance between each terminal of “E03-13” and “E03-
26” and vehicle body ground.
Is resistance less than 2
Ω
?
Go to Step 4. “BLK” wire circuit in
open or high resistance.
4 1) Measure voltage between positive battery terminal and
vehicle body ground with engine running.
Is voltage 9.7
±
0.3 V or more?
Imperfect short between
“WHT/BLU” wire circuit
and body ground.
Check charging system
referring to “Generator
Test (Undercharged
Battery Check) in
Section 1J”.
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