Code
C1358
HYUNDAI
C — Chassis
AVH Switch Error | AVH not Available due to EPB in Emergency Release
Views:
UK: 19
EN: 26
RU: 51
AI status
Completed
Completed
100%
Causes
- Faulty AVH switch (mechanical or electrical)
- Open or short in AVH switch wiring or connectors
- Corroded or loose connector at AVH switch, BCM or EPB module
- EPB in emergency release / mechanical release mode
- Faulty Body Control Module (BCM) / AVH control unit or firmware error
- CAN bus communication fault between BCM, EPB module and instrument cluster
Symptoms
- AVH (Auto Vehicle Hold) warning or disabled message on instrument cluster
- AVH will not engage or indicator light does not illuminate
- EPB warning lamp or message present
- Possible inability to release or apply EPB normally
- DTC stored and AVH function disabled
What to check
- Read and record freeze frame and all stored DTCs from all modules (BCM, EPB module, ABS/ESC)
- Check battery voltage (should be >12.4 V with key on) and main grounds
- Visually inspect AVH switch, harness, and connectors for damage or corrosion
- Confirm EPB is not in emergency release (check EPB status in scan tool and physically inspect calipers/actuator)
- Check for related EPB or CAN communication codes in other modules
- Attempt to operate AVH while monitoring live data for AVH switch state and EPB status
Signal parameters
- Battery voltage at AVH switch connector (nominal ~12 V / key on)
- Ground continuity from switch ground to chassis (0 ohms ~ small)
- AVH switch continuity/resistance between terminals when toggled
- AVH switch status bit in BCM/AVH data (ON/OFF) via scan tool
- EPB status/live data (normal, applied, released, emergency release)
- CAN bus diagnostic messages for BCM and EPB module (no errors, correct periodic messages)
Diagnostic algorithm
- Retrieve all related codes from BCM, EPB module and ABS/ESC using a capable scan tool and save results.
- Verify battery voltage and main ground integrity. Low voltage can create false errors.
- Check for EPB emergency release condition: read EPB status with scan tool. If EPB is in emergency release, inspect EPB actuator and mechanical release procedure before AVH diagnosis.
- Visually inspect AVH switch and wiring harness for damage, loose connectors or corrosion. Repair as needed.
- With the ignition ON, monitor AVH switch status in live data while actuating the switch. If the switch does not change state or shows intermittent, measure switch continuity/resistance and supply/ground voltages at the connector.
- Check continuity and shorts to battery/ground between switch and BCM/AVH control unit. Repair any open/short circuits.
- Use the scan tool to observe CAN communication between BCM and EPB module. If CAN errors present, trace wiring, termination and module power/ground.
- If wiring and communications are good but the switch is faulty, replace AVH switch and clear codes. Retest AVH operation.
- If fault remains after switch replacement, check/replace BCM or EPB module only after confirming installation, wiring and software are correct (consult manufacturer repair information).
- After repairs, clear DTCs, perform functional tests for AVH and EPB, and confirm no reoccurrence under normal conditions.
Likely causes
- Disconnected/corroded connector or damaged wiring at the AVH switch
- EPB system is in emergency release mode (mechanical release active)
- Faulty AVH switch
- Intermittent CAN communication between EPB module and BCM
Fault status
Status
AVH Switch Error — AVH unavailable; EPB in emergency release
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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