B1297

Code

Other B — Body

Power Supply Sensor Circuit Open

Brand: Other

Type: B — Body

Views: UK: 23 EN: 37 RU: 29

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Blown fuse that supplies sensor power
Open or broken wiring in the sensor power feed
Disconnected or corroded connector at the sensor or harness
Failed sensor (internal open)
Poor or open ground for the sensor supply return
Control module/harness connector fault or internal module failure

Symptoms

System related to that sensor inoperative or using default/calculated values
Warning or malfunction indicator on dash (depending on system)
Loss of the affected function (climate, body function, restraint sensor, etc.)
Related diagnostic trouble codes stored
Intermittent operation if connection is intermittent

What to check

Read stored freeze-frame and related codes to identify affected sensor/system
Visually inspect sensor connector, pins, and harness for damage or corrosion
Check relevant fuses (sensor power/reference) for continuity
Backprobe harness at sensor connector and measure supply voltage with key ON
Perform continuity check between sensor power pin and supplying module pin
Check ground continuity for the sensor circuit

Signal parameters

Sensor supply/reference voltage typically ~5.0 V (±0.5 V) for low-voltage sensors
Some sensors use ignition or battery voltage: expect battery voltage (~12 V) when key ON
Open circuit = no measurable voltage at the sensor power pin (0 V or OL on resistance)
Ground return should show low resistance to chassis ground (
Continuity between sensor and module power terminal should be close to 0 ohms; open = infinite resistance

Diagnostic algorithm

Confirm code and record related codes and freeze-frame data. Identify which sensor and which module report the fault.
Turn ignition OFF and perform a visual inspection of the sensor, connector, and wiring for obvious damage, corrosion, or connectors not fully seated.
Check fuses and relays supplying the sensor power/reference. Replace any blown fuses and test again.
With ignition ON (engine off unless specified), backprobe the sensor power pin and measure voltage. If voltage is present at harness and not at the sensor pin, inspect connector/pins and terminal contact.
If no voltage at the harness, trace supply back to the controlling module: check continuity between sensor power pin and module power output pin. Repair any open circuits.
Verify ground continuity for the sensor return. Repair any open or high-resistance ground connections.
If supply and ground at the harness are good but the sensor still reports open, disconnect sensor and measure resistance/power pin on the sensor side. Replace the sensor if internal open is confirmed.
If harness and sensor are good but module output is missing, test module supply and outputs; check module connectors and consider module fault if wiring is intact.
After repair, clear codes and perform functional test / drive cycle to confirm the fault does not return.

Likely causes

Blown 5V or 12V sensor supply fuse
Pin pulled/separated at sensor connector
Broken conductor where harness flexes
Corrosion inside connector causing open circuit
Sensor internal failure causing open power pin
Open continuity between module and sensor supply terminal

Fault status

⚠️ Status

B1297 — Power Supply Sensor Circuit Open. The control module detects an open (no voltage) on the sensor power/reference circuit; inspect fuses, wiring, connectors, sensor, and module.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2 hours