B1493

Code

Other B — Body

Ignition Cylinder Sensor Battery Short

Brand: Other

Type: B — Body

Views: UK: 21 EN: 35 RU: 32

AI status

Completed

ready

Completed 100%

Page language: EN

Verify owner reports and note when code sets (key on, engine off; during cranking; always)
Check battery voltage at battery terminals (engine off and cranking)
Inspect related fuses and fusible links for continuity and correct rating
Visually inspect ignition cylinder sensor connector and harness for damage, corrosion, or pinched areas
Measure voltage at the ignition cylinder sensor power pin with key ON and key OFF as required
Perform short-to-ground and short-to-battery resistance checks on the harness (with battery disconnected)

Expected supply voltage at ignition cylinder sensor: ~11–14.5 V with battery healthy and ignition ON
Expected quiescent (OFF) voltage: 0 V or open depending on design; some systems remove feed when off
Normal sensor current draw: typically low (0.5 A suggests a short
Short-to-ground: measured voltage near 0 V at power pin with feed expected ON
Short-to-battery/constant feed: measured battery voltage present at power pin when it should be off

Record freeze frame and related codes. Note when code appears (key position/engine state).
Visually inspect ignition cylinder sensor, connector, and harness routing for damage, corrosion, or pinch points. Repair obvious damage.
Check and verify fuses/fusible links for the ignition circuit. Replace any blown items with correct rating.
With battery voltage known, backprobe the sensor power pin with key ON and measure voltage. Compare to expected values in signal_params.
If low or zero, disconnect sensor and measure supply at harness connector. If supply present at harness but not at sensor, suspect connector or sensor.
If supply is low or shorted, disconnect battery and perform resistance check between the power feed and ground to locate short. Isolate sections of harness (disconnect connectors) to narrow location.
If a short to battery (feed present when it should be off) is observed, trace accessory/aftermarket wiring or module outputs tied to that circuit.
If harness and connectors check good, bench-test or replace the ignition cylinder sensor and re-test.
After repair, clear codes, perform functional test (key cycles, crank), and monitor for recurrence. If code returns with good wiring and new sensor, suspect module/ECU fault and refer to manufacturer procedures.

Power feed pin in ignition cylinder connector shorted to ground by chafed insulation
Power feed tied directly to battery feed after a previous repair or aftermarket device
Ignition cylinder sensor internal short (failed component)
Water ingress or corrosion in connector causing low resistance path
Intermittent short due to harness rubbing on chassis or components