DTC 88

88 RED "BRAKE" WARNING LAMP CIRCUIT SHORTED TO BATTERY

DTC 88 Red BRAKE Warning Lamp Circuit Shorted To Battery:

DTC 88 Red BRAKE Warning Lamp Circuit Shorted To Battery:

Circuit Description:
This DTC identifies a short to battery between the EBCM and the red "BRAKE" warning lamp, or an open driver that does not allow the red "BRAKE" warning lamp to be illuminated by the EBCM. This will only occur if an ABS fault is detected that may degrade base brake operation.

DTC Will Set When:
DTC 88 can be set only at the beginning of the three second bulb check. If the EBCM detects battery voltage on the red "BRAKE" warning lamp control circuit, a malfunction exists.

Action Taken:
A malfunction DTC is stored. ABS is not disabled.

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Identifies if the ground circuit to the red "BRAKE" warning lamp is being completed by a source other than the EBCM.
2. Identifies if the malfunction is currently present.
3. By removing Fuse 39, the voltage source is eliminated. This test indicates if voltage is being supplied from a source other than the gauge fuse.
4. Ensures malfunction was not due to physical damage of the circuitry.
5. Checks for DTC 86 also being set.

Diagnostic Aids:
An "Intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Tech 1.

Any circuitry, that is suspected as causing the intermittent complaint, should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.