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DTC P1531: Dash Integration Module (Dim)

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 of the diagnostic procedure.
  1. 3  - Tests for the proper operation of the circuit in the high voltage range.
  2. 4  - Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper wire opens when you perform this test, the signal circuit is shorted to voltage.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM. After performing system check, go to next step.
  2. Connect scan tool. Turn ignition on. Using scan tool, observe EVAPORATOR TEMP. parameter in DASH INTEGRATION MODULE A/C INFORMATION data list. If scan tool indicates EVAPORATOR TEMP. parameter is within -34°F to 261°F (-37°C to 127°C), inspect wiring and connectors for intermittent loose wires and/or poor connections. If scan tool indicates EVAPORATOR TEMP. parameter is not within -34°F to 261°F (-37°C to 127°C), go to next step.
  3. Turn ignition off. Disconnect A/C refrigerant low temperature sensor. Turn ignition on. Using scan tool, observe EVAPORATOR TEMP. parameter in DASH INTEGRATION MODULE A/C INFORMATION data list. If scan tool indicates EVAPORATOR TEMP. parameter is -34°F (-37°C) or less, go to next step. If scan tool indicates EVAPORATOR TEMP. parameter is more than -34°F (-37°C), go to step  5.
  4. Turn ignition off. Connect 3-amp. fused jumper wire between terminals "A" (Black/White wire) and "B" (Gray wire) of A/C refrigerant low temperature sensor harness connector. Turn ignition on. Using scan tool, observe EVAPORATOR TEMP. parameter in DASH INTEGRATION MODULE A/C INFORMATION data list. If scan tool indicates EVAPORATOR TEMP. parameter is 261°F (127°C) or less, go to step  6. If scan tool indicates EVAPORATOR TEMP. parameter is more than 261°F (127°C), check for loose wires and poor connections at A/C low temperature sensor harness connector. Repair as necessary and go to step  7. If wiring and connections are okay, replace A/C low temperature sensor. See A/C REFRIGERANT LOW TEMPERATURE SENSOR  under REMOVAL & INSTALLATION. Go to step  7.
  5. Check Gray wire for short to ground. If short is found, repair wire and go to step  7. If short is not found, check for loose wires and/or poor connections at DIM. If wiring and connections are okay, replace DIM. See DASH INTEGRATION MODULE (DIM)  under REMOVAL & INSTALLATION. Go to step  7.
  6. Check for open, high resistance or short to voltage between ground and terminal "B"(Gray wire) of A/C refrigerant low temperature sensor harness connector. See Figure. Repair as necessary. Go to next step. If no problem is found, check for open or high resistance in Black/White wire between DIM and A/C refrigerant low temperature sensor. Repair as necessary and go to next step. If circuit is okay, check for loose wires and/or poor connections at DIM. If wiring and connections are okay, replace DIM. See DASH INTEGRATION MODULE (DIM)  under REMOVAL & INSTALLATION. Go to next step.
  7. 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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