C1107

Code

Other C — Chassis

ABS Function Enabled Input Circuit Failure

Brand: Other

Type: C — Chassis

Views: UK: 31 EN: 70 RU: 48

AI status

Completed

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Page language: EN

Causes

Open or shorted wiring between ABS module and receiving control module
Corroded, loose or damaged connector pins at ABS module or receiving module
Blown fuse or poor power/ground related to the circuit
Water intrusion or corrosion in wiring harness or connector
Failed ABS control module or receiving module input circuit
Aftermarket device or recent repair disturbed the wiring

Symptoms

ABS warning light illuminated (may also show ESC/traction control warning)
ABS and/or traction control may be disabled
Possible reduced braking stability under hard braking
Intermittent warnings or fault lamp that returns after driving
Related drivability issues only if other systems use the same signal

What to check

Read stored freeze-frame and all related DTCs with a capable scan tool
Check for other ABS/CAN/bus faults that may be related
Visually inspect ABS and harness connectors for corrosion, bent pins, or water
Check fuses and battery/ground connections related to ABS and receiving module
Backprobe the input pin at the receiving module and the output pin at the ABS module and compare
Perform wiggle test of wiring while monitoring the input signal and watching for code recreation

Signal parameters

Typical expected states: logical HIGH = battery voltage (~9–14 V), logical LOW = ~0 V (depends on design)
Input should be stable at key-on and change state only during ABS enable/disable events
No short to ground or to battery when measured between signal and ground/power
Continuity between ABS module output pin and receiving module input pin (low ohm) when disconnected and isolated
No intermittent drops or noise on the signal when monitored with a digital scope

Diagnostic algorithm

Connect a scan tool, record C1107 and any related DTCs, and note freeze-frame data and conditions when the fault set.
Visually inspect connectors and harness from ABS module to the receiving control module for damage, corrosion, or water entry. Repair as necessary.
Verify related fuses, power and ground points are present and within spec for both ABS and receiving module.
With ignition ON (engine off unless instructed otherwise), backprobe the receiving module input wire and ABS module output wire. Confirm expected voltage states (see signal_params).
Check continuity between the two modules on the signal wire. Repair any open or high-resistance wiring. Check for shorts to battery or ground.
If intermittent, perform a wiggle test and monitor live data or scope the signal to reproduce the fault. Repair chafed wires or faulty connectors found.
If wiring and connectors pass, test or substitute the ABS module or the receiving module per manufacturer procedures (or have them bench-tested).
After repairs, clear codes, verify proper communication and that warning lamps remain off during a road test under conditions that previously set the code.

Likely causes

Damaged or corroded connector at ABS or receiving module
Open/short in the intermodule harness (most common)
Failed ABS module output or receiving module input
Blown related fuse or poor ground

Fault status

⚠️ Status

ABS Function Enabled Input circuit failure detected. Signal is out of expected range, open, shorted or intermittent. ABS/ESC functions may be disabled.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours