Code
C1702
LAND ROVER
C — Chassis
Right rear corner sensor - short circuit to battery
Views:
UK: 10
EN: 26
RU: 22
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness (abrasion, chafing) causing the sensor signal or supply wire to contact a battery feed.
- Corroded/contaminated or bent connector terminals creating a high-voltage path.
- Internal short or failure inside the right rear corner sensor module.
- Incorrect or damaged aftermarket equipment routed near the sensor harness.
- Poor repair or pinched wiring after collision or body work.
- Faulty control module (less common) or grounding problem that causes erroneous voltage readings.
Symptoms
- Parking aid/parking assist warning lamp or message illuminated.
- Right rear parking aid not working; no sensor readings or constant/incorrect distance values.
- Intermittent or constant audible warning/beeps from parking assist when not near obstacles.
- Stored DTC C1702 (may be accompanied by other corner sensor codes).
What to check
- Retrieve freeze-frame and live data with a capable scan tool; confirm C1702 and note any related codes.
- Visually inspect right rear bumper area, sensor, and wiring harness for damage, rubbing, pinch points, or corrosion.
- Visually inspect sensor connector for bent pins, corrosion, water/dirt intrusion and secure locking tab.
- Backprobe sensor connector with ignition ON and measure voltages at the supply and signal pins with a multimeter.
- Measure resistance/continuity between the suspected sensor supply/signal wire and battery positive to confirm a short.
- Perform wiggle test on harness/connector while monitoring live data for intermittent changes.
Signal parameters
- Supply voltage: ~12 V (battery voltage) on the sensor power pin with ignition ON if circuit is powered.
- Signal/trigger line: depending on sensor type, may be a pulsed echo or switched return — should not be constant battery voltage.
- Resistance to battery positive: low resistance if shorted; normal high resistance/open circuit when disconnected.
- Module fault flags: parking aid module will report sensor status (OK/Short to battery/Open circuit) via scan tool.
Diagnostic algorithm
- Connect an advanced scan tool, read DTCs, and view live data for the right rear sensor and related nodes. Record freeze frame if present.
- Visually inspect the right rear bumper, sensor, wiring and connector for damage, water ingress, corrosion, dirt or pinched wiring. Repair obvious physical damage.
- With ignition ON (engine off), backprobe the sensor connector: measure supply pin voltage and signal pin voltage. Compare to expected (~12 V supply, variable signal).
- If supply pin is at battery voltage where it should not be, isolate the harness: disconnect the sensor and re-measure at the harness side. If the harness still measures battery, the short is upstream; if it disappears, suspect sensor internal short.
- Check continuity/resistance from the sensor power/signal wire to battery positive. Low resistance indicates a short to battery. Also check for continuity to chassis ground where applicable.
- Perform a wiggle test on the harness/connector while monitoring live data or voltage to identify intermittent shorts.
- If wiring looks good and harness side voltage is normal with sensor disconnected, replace the sensor and re-test. If the short remains with the sensor disconnected, trace wiring back toward harness, fuse box, and junctions to locate the contact point with battery feed.
- Repair any damaged wiring or connector (repair or replace harness/connector pins with OEM-recommended methods). Protect repaired section with conduit/loom and secure to avoid future chafing.
- Clear codes and perform functional test / drive cycle. Verify code does not return and parking aid functions correctly.
- If the issue persists after sensor and wiring repairs, inspect the parking aid/control module for internal faults and consult manufacturer service information before replacing.
Likely causes
- Wiring harness short to battery on the right rear corner sensor circuit.
- Connector corrosion or water ingress at the right rear sensor plug.
- Failed right rear corner sensor (internal short to supply).
- Harness routed over a sharp edge or anchor point causing insulation breach.
Fault status
Status
Right rear corner sensor circuit has a short to battery; parking aid may be disabled for that corner.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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