4F-27 Electronic Stability Program:
DTC C1018: Brake Fluid Level Switch Failure
S5JB0E4604027
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Troubleshooting
[A]
E53
16
1
15
2
3
4
5
6
7
8
9
10
11
12
13
14
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
RED/BLK
E53-13
E53-44
RED
WHT
RED
WHT
12V
1
2
3
4
5
6
2
G31-1
G31-3
G31-7
G31
12347891011141516
36 3435 24 23 212228 27 25263739 3840
18 17 13 121920
[B]
I6JB01460017-02
[A]: ESP® control module connector (viewed from terminal side) 2. CAN driver 5. Brake fluid level switch
[B]: BCM connector (viewed from harness side) 3. Junction connector 6. ESP® hydraulic unit control module assembly
1. BCM 4. To TCM, 4WD control module, keyless
start control module, combination
meter and steering angle sensor
DTC Detecting Condition Trouble Area
• Brake fluid level is too low.
• Input voltage of brake fluid level switch to BCM is low.
• Brake fluid level
• Brake fluid level switch circuit
• Brake fluid level switch
•BCM
• ESP® control module
Step Action Yes No
1 Was “Electronic Stability Program Check” performed? Go to Step 2. Go to “Electronic
Stability Program
Check: ”.
2 Check brake fluid level
1) Check brake fluid level in reservoir.
Is brake fluid level upper than the minimum level?
Go to Step 3. Replenish brake fluid to
reservoir.
3 DTC check for ESP®
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Turn ignition switch ON and check DTC for ESP®.
Is DTC U1073 and/or U1140 detected?
Go to applicable DTC
diag. flow.
Go to Step 3.
4 Check brake fluid level switch
1) Turn ignition switch to OFF position.
2) Disconnect brake fluid level switch connector.
3) Check for proper connection at each terminal of brake
fluid level switch connector.
4) If OK, then check brake fluid level switch referring to
“Brake Fluid Level Switch Inspection: in Section 9C in
related manual”.
Is check result OK?
Go to Step 5. Replace brake fluid
level switch.
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