Instrument Panel, Gauges and Warning Indicators Diagnosis

DTC B0021

CIRCUIT DESCRIPTION
The resistance presented to the instrument cluster on terminal X1-28 is dependent upon the button selected on the trip computer switch. DTC 21 will set if the trip computer switch resistance is less than 1000 ohms for 100 milliseconds. The DTC is reset as soon as the switch resistance is greater than 1000 ohms. The DTC is logged as a History DTC.

DIAGNOSTIC AIDS
By manipulating the harnesses at the various connectors it is often possible to isolate the cause of the circuit interruption. This harness can then be removed and repaired. Inspect for any damage to the harness, which could cause an intermittent open or short to earth or backed out terminals at the instrument cluster connectors, broken connector locks, improperly formed or damaged terminals. The multimeter allows continuity of the wiring harness circuit 894 to be checked.

TEST

Step 1 - Step 7:

DTC 21 - TRIP COMPUTER SWITCH VOLTAGE LOW