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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 30 (HVAC SYSTEMS - AUTOMATIC)DIAGNOSTIC TESTSDTC B0164: INSIDE AIR TEMPERATURE SENSOR
1999 GMC Forward Control 5.7 R, Automatic

DTC B0164: Inside Air Temperature Sensor

1999 GMC Forward Control 5.7 R, AutomaticSECTION DTC B0164: Inside Air Temperature Sensor
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: The numbers below refer to the step numbers for the diagnostic procedure.
  1. 2  - The operating range of the sensor is 0.09-4.90 volts. If the scan tool displays a value of 0-0.08 volts or 4.91-5.0 volts, then the sensor is performing outside of its designed limits.
  2. 3  - Tests for the proper operation of the circuit in the high voltage range.
  3. 4  - Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK . After performing system check, go to next step.
  2. Connect scan tool and turn ignition on. Using scan tool, observe INSIDE AIR TEMP parameter in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates INSIDE AIR TEMP parameter is within 0.09-4.90 volts, inspect wiring and connectors for intermittent loose wires and/or poor connections. If scan tool indicates INSIDE AIR TEMP parameter is not within 0.09-4.90 volts, go to next step.
  3. Turn off ignition. Disconnect inside air temperature sensor harness connector. Turn ignition on. Using scan tool, observe INSIDE AIR TEMP parameter in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates INSIDE AIR TEMP parameter is more than 4.90 volts, go to next step. If scan tool indicates INSIDE AIR TEMP parameter is 4.90 volts or less, go to step  5.
  4. Turn ignition off. Connect a 3-amp fused jumper wire between terminals "A" (Dark Green wire) and "B" (Yellow wire) of inside air temperature sensor harness connector. See Figure. Turn ignition on. Using scan tool, observe INSIDE AIR TEMP parameter in INSTRUMENT PANEL MODULE OPEN/SHORT data list. If scan tool indicates INSIDE AIR TEMP parameter is 0.09 volts or less, check for loose wires and/or poor connections to inside air temperature sensor. If wiring and connectors are okay, replace inside air temperature sensor. See INSIDE AIR TEMPERATURE SENSOR  under REMOVAL & INSTALLATION. Go to step  8. If scan tool indicates INSIDE AIR TEMP parameter is more than 0.09 volts, go to step  6.
  5. Check continuity between ground and terminal "A" (Dark Green wire) of inside air temperature sensor harness connector. See Figure. If continuity exists, repair short to ground in Dark Green wire between terminal B4 of Instrument Panel Module (IPM) and upper inside air temperature sensor. Go to step  8. If continuity does not exist, check for loose wires and/or poor connections at IPM. If wires and connections are okay, replace IPM. See INSTRUMENT PANEL MODULE (IPM)  under REMOVAL & INSTALLATION. Go to step  8.
  6. Check for voltage between ground and terminal "A" of inside air temperature sensor. If voltage exists, repair short to voltage in Dark Green wire between terminal B4 of Instrument Panel Module (IPM) and inside air temperature sensor. Go to step  8. If voltage does not exist, go to next step.
  7. Check continuity in Yellow wire between terminal "B" of inside air temperature sensor and terminal B8 of IPM. If continuity exists check for loose wires and/or poor connections at IPM. If wires and connections are okay, replace IPM. See INSTRUMENT PANEL MODULE (IPM)  under REMOVAL & INSTALLATION. Recalibrate IPM. Go to next step. If continuity does not exist, repair open or high resistance in Yellow wire and go to next step.
  8. Use scan tool to clear DTCs. Operate vehicle and verify that DTCs do not reset. If DTCs reset, return to step  2. If DTCs do not reset, system is okay.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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