Tech Tip: Flash Procedure for 1996-1999 and some 2000-2001 Cadillacs – UnderhoodService

Tech Tip: Flash Procedure for 1996-1999 and some 2000-2001 Cadillacs

The following steps are necessary to allow on-board Flash reprogramming of the ECC on certain Cadillac models. The power feed to the ECC must be disconnected before reprogramming. Before disconnecting the power, the ignition key must be placed in the LOCK position for a minimum of 30 seconds. This process allows the ECC to store

The following steps are necessary to allow on-board Flash reprogramming of the ECC on certain Cadillac models.

The power feed to the ECC must be disconnected before reprogramming.

Before disconnecting the power, the ignition key must be placed in the LOCK position for a minimum of 30 seconds. This process allows the ECC to store ­values for the transaxle fluid life, transaxle shift adaptive and throttle position learned values into the EEPROM section of the ECC.

Failure to wait the specified time (30 seconds) will result in an EEPROM reset and loss of transaxle fluid life info and a reset value back to 0.

To Flash reprogram Cadillacs from model years 1996-’99 perform the following process:
• Locate the ECC. With the ignition in the LOCK position, wait 30 seconds, then carefully remove the clear connector on the ECC.
• Reprogram the ECC as outlined in the vehicle’s service manual.

To Flash reprogram Cadillacs from model years 2000-’01 Seville and Deville models (VIN K):
• Place the ignition key in the LOCK position, wait 30 seconds, then pull instrument panel cluster (IPC) fuse #7 (located in underhood panel) and ignition fuse #12 (located under back seat). Pulling the fuses indicated will allow Flash reprogramming of these applications.
• Reprogram the ECC as outlined in the vehicle’s service manual.

Maintain 12.5-13 volts during the reprogramming process. Failure to do so will result in an ECC failure! Refer to your vehicle’s service manual for specific service procedures. The ignition switch supplies power to the ECC in all key positions except LOCK. To avoid ECC damage when removing or installing any ECC, always put the switch in the LOCK position.

Visit www.cardone.com for more details on Flash. 

You May Also Like

Battery Charging and Diagnostics

Here are six tips to use when diagnosing a vehicle with a dead battery. 

Remember the good old days of battery and alternator testing? With just a multimeter you could test if the alternator was charging and if the battery had a decent state of charge. On most late-model vehicles, the battery and alternator are managed together to minimize the load on the engine to boost fuel economy.

Voltage Drop Testing

The measurement of voltage is like the speed of the traffic.

Spark Plug Fouling

Understanding why spark plugs get dirty.

Why Alternators Are Subject To Ripple Voltage

The alternator produces an AC current that must be converted into DC current by way of a rectifier.

Understanding Stop/Start Charging and Starting Systems

The problem may not have been caused by a complicated reason, something simple may have caused the system not to work.

Other Posts

Hyundai & Kia Hybrid Drivetrain

The Hyundai hybrid system has a motor control unit (MCU) and hybrid control unit (HCU).

GM Diagnostic Tip on Misfires, Noises and DTCs

Determine which description best matches the vehicle you are working on, and perform the suggestions as necessary.

Ignition Coil Output

To see inductance inside the primary windings, use an amp probe placed around the positive wire for the ignition coil.

Compressor Oil for R1234yf

Working on R-1234yf systems is not that different from the R-134a variety.