Code
B1972
HUMMER
B — Body
Low Power Driver Fault
AI status
Completed
Completed
100%
Causes
- Low vehicle battery voltage or weak battery
- Poor or corroded battery, chassis, or module ground(s)
- Open or high-resistance power feed (fuse, fusible link, relay, wiring)
- Short to ground or partial short in the load or harness
- Damaged connector pins or poor terminal contact at the module or load
- Control module internal driver failure
Symptoms
- Affected device(s) operate intermittently, weakly, or not at all
- Stored B1972 trouble code and possible related warnings/messages
- Affected system may enter a reduced-function or limp mode
- Electrical clicks, fuses blowing, or visible arcing at a connector (in severe cases)
What to check
- Verify vehicle battery state-of-charge and cranking/charging voltages
- Check for additional stored codes and freeze-frame data
- Inspect fuses, fusible links and relays for the circuit; replace as needed
- Visually inspect connectors and wiring for damage, corrosion, or loose terminals
- Measure voltage at the module power input and at the load connector with the circuit off and under activation
- Verify integrity of module and chassis grounds (measure resistance to battery negative)
Signal parameters
- Battery voltage at rest: typically 12.4–12.8 V (nominal); while running: 13.5–14.8 V
- Acceptable supply at module power pin when active: ~11–14.8 V (vehicle dependent); reading
- Ground resistance from module ground to battery negative:
- Driver output (when commanded ON): near battery voltage (saturated) or PWM signal depending on function — verify with scope
- Load resistance (expected approximate): depends on device; significantly higher than specification indicates open/high-resistance
- Current draw: compare measured current to known specification for the load; excessive current may indicate short or failing load
Diagnostic algorithm
- Retrieve and record B1972 and any other stored codes and freeze-frame data. Clear codes and perform a functional test to see if the code returns.
- Check battery voltage and charging system. Charge or replace weak battery and verify alternator output before further testing.
- Inspect and verify all fuses, fusible links, and relays for the affected circuit. Replace suspicious components and retest.
- Visually inspect connectors, pins and wiring for the affected circuit for corrosion, damage, or loose terminals. Repair as required.
- With appropriate safety precautions, measure voltage at the module power input and the load connector while operating the circuit. Compare to expected values.
- Measure ground resistance from the module to battery negative. Clean and secure grounds if resistance is high.
- Check for short-to-ground or short-to-battery on the driver output using an ammeter or wiring isolation methods. Repair wiring faults as found.
- If wiring and power/ground are good, verify driver output waveform with an oscilloscope while commanding the function. Look for clipping, sagging, or no output.
- If the module driver is confirmed faulty (internal short/open or no output) and wiring is good, consult manufacturer procedure for module reprogramming or replacement.
- After repairs, clear codes and perform full system test and road test (if applicable). Monitor for return of code or related symptoms.
Likely causes
- Blown or corroded fuse / faulty relay in the driver circuit
- High resistance at ground or power pin (loose/dirty connector)
- Weak battery or charging system not supplying required voltage
- Wiring damage (chafed insulation, pinched harness) causing voltage drop
- Failed power driver stage inside the control module
Fault status
Status
Low power detected on a module driver circuit. The module has detected insufficient supply or driver performance and logged a fault.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
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Code
B1972
Other
B — Body
Passenger Rear Seat Up Switch Circuit Short to Battery
AI status
Completed
Completed
100%
Causes
- Low vehicle battery voltage or weak battery
- Poor or corroded battery, chassis, or module ground(s)
- Open or high-resistance power feed (fuse, fusible link, relay, wiring)
- Short to ground or partial short in the load or harness
- Damaged connector pins or poor terminal contact at the module or load
- Control module internal driver failure
Symptoms
- Affected device(s) operate intermittently, weakly, or not at all
- Stored B1972 trouble code and possible related warnings/messages
- Affected system may enter a reduced-function or limp mode
- Electrical clicks, fuses blowing, or visible arcing at a connector (in severe cases)
What to check
- Verify vehicle battery state-of-charge and cranking/charging voltages
- Check for additional stored codes and freeze-frame data
- Inspect fuses, fusible links and relays for the circuit; replace as needed
- Visually inspect connectors and wiring for damage, corrosion, or loose terminals
- Measure voltage at the module power input and at the load connector with the circuit off and under activation
- Verify integrity of module and chassis grounds (measure resistance to battery negative)
Signal parameters
- Battery voltage at rest: typically 12.4–12.8 V (nominal); while running: 13.5–14.8 V
- Acceptable supply at module power pin when active: ~11–14.8 V (vehicle dependent); reading
- Ground resistance from module ground to battery negative:
- Driver output (when commanded ON): near battery voltage (saturated) or PWM signal depending on function — verify with scope
- Load resistance (expected approximate): depends on device; significantly higher than specification indicates open/high-resistance
- Current draw: compare measured current to known specification for the load; excessive current may indicate short or failing load
Diagnostic algorithm
- Retrieve and record B1972 and any other stored codes and freeze-frame data. Clear codes and perform a functional test to see if the code returns.
- Check battery voltage and charging system. Charge or replace weak battery and verify alternator output before further testing.
- Inspect and verify all fuses, fusible links, and relays for the affected circuit. Replace suspicious components and retest.
- Visually inspect connectors, pins and wiring for the affected circuit for corrosion, damage, or loose terminals. Repair as required.
- With appropriate safety precautions, measure voltage at the module power input and the load connector while operating the circuit. Compare to expected values.
- Measure ground resistance from the module to battery negative. Clean and secure grounds if resistance is high.
- Check for short-to-ground or short-to-battery on the driver output using an ammeter or wiring isolation methods. Repair wiring faults as found.
- If wiring and power/ground are good, verify driver output waveform with an oscilloscope while commanding the function. Look for clipping, sagging, or no output.
- If the module driver is confirmed faulty (internal short/open or no output) and wiring is good, consult manufacturer procedure for module reprogramming or replacement.
- After repairs, clear codes and perform full system test and road test (if applicable). Monitor for return of code or related symptoms.
Likely causes
- Blown or corroded fuse / faulty relay in the driver circuit
- High resistance at ground or power pin (loose/dirty connector)
- Weak battery or charging system not supplying required voltage
- Wiring damage (chafed insulation, pinched harness) causing voltage drop
- Failed power driver stage inside the control module
Fault status
Status
Low power detected on a module driver circuit. The module has detected insufficient supply or driver performance and logged a fault.
Repair difficulty: Medium
Diagnostic time: 0.5-2 hours
Similar codes
Repair manuals
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