Code
B1497
FIAT
B — Body
Tailgate anti-theft sensor circuit short to positive
Views:
UK: 4
EN: 7
RU: 5
AI status
Completed
Completed
100%
Causes
- Wiring shorted to battery positive (chafed harness, pin pushed through, contact with body/other wire)
- Corroded or contaminated connector causing a high-voltage path
- Failed tailgate anti-theft sensor or internal short
- Faulty or damaged Body Control Module (BCM) input circuit
- Improper aftermarket alarm/remote or recent bodywork with damaged wiring
Symptoms
- DTC B1497 stored or lamp/message on dash
- Tailgate alarm may trigger erroneously or be inactive
- Tailgate lock/unlock may be intermittent or not operate
- Possible parasitic battery drain when vehicle is off
- Intermittent operation that changes when tailgate is moved or wiring is flexed
What to check
- Read and record freeze frame and live data with a scan tool; confirm B1497 presence and any related codes
- Visual inspection of tailgate wiring harness, especially at hinge area and connector for chafing, pinched wires or corrosion
- Inspect and clean tailgate sensor connector pins; check for water intrusion
- Check for aftermarket alarm or recent repairs that could affect the circuit
- Measure voltage at the sensor connector with connector disconnected: expect near 0 V (or open) — voltage near battery positive indicates short
- Perform continuity checks from sensor pin to battery positive/ground as appropriate to confirm short or open
Signal parameters
- Normal inactive: open or low (approx. 0–0.5 V) on sensor input (depends on vehicle design)
- Fault condition (short to positive): battery voltage present (~10–14 V) at sensor input
- Oscillation or intermittent: voltage may jump between low and battery voltage when harness is moved
- No signal / open circuit: no voltage or infinite resistance to expected reference
Diagnostic algorithm
- Retrieve and record all stored codes and freeze-frame data with a scan tool. Clear codes and attempt to re-run the fault to confirm repeatability.
- Visually inspect tailgate harness, grommet/boot at hinge, sensor connector and routing for damage, corrosion, rodent chew, or signs of recent repair.
- Disconnect the tailgate anti-theft sensor connector. With ignition on, measure voltage at the BCM-facing pin for that circuit. If ~12 V present with sensor disconnected, suspect wiring short to battery or BCM output issue.
- With connector disconnected, check resistance from sensor wire to battery positive and to chassis ground to identify unintended continuity. Low resistance to battery positive indicates a short to positive.
- Perform a wiggle/flex test of the harness from tailgate to body while monitoring voltage or live data. Note any changes that replicate the fault.
- Inspect and clean connector contacts; repair or replace any corroded pins or damaged connector housings.
- If wiring damage is found, repair or replace the damaged section (splice only with proper solder/heat-shrink or OEM repair methods) and protect routing at hinge points.
- If wiring and connector are good, bench-test or replace the tailgate sensor. Reconnect and verify the fault clears.
- If fault persists after sensor replacement and wiring verified, investigate BCM input by checking for correct reference voltages and consult wiring diagrams. Replace BCM only after confirming input circuit fault.
- After repairs, clear codes and verify repair by cycling tailgate, locking/unlocking, and performing drive/park cycle as required to confirm no reoccurrence.
Likely causes
- Damaged/chafed tailgate harness where it passes the hinge or body (most common)
- Corroded connector at the tailgate sensor or BCM connector
- Failed sensor in tailgate assembly
- Aftermarket alarm/remote wiring tied into the sensor circuit
- Less likely: BCM internal failure
Fault status
Status
Tailgate anti-theft sensor circuit short to positive detected (B1497). High voltage present on sensor input; fault stored.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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