Normal Operation

NOTE:

The smart junction box (SJB) is also known as the generic electronic module (GEM).

The instrument cluster receives the speed control status from the SJB/GEM over the high speed controller area network (HS-CAN) communication bus. When the speed control has been engaged, the SJB/GEM sends a message to the instrument cluster to illuminate the speed control indicator. The instrument cluster sets DTC U0100 in continuous memory if the speed control message is missing for more than 5 seconds and the instrument cluster turns off the speed control indicator.

This pinpoint test is intended to diagnose the following:

PCM
Instrument cluster

SPEED CONTROL INDICATOR PINPOINT TEST 15

PINPOINT TEST 15		THE SPEED CONTROL INDICATOR IS NEVER/ALWAYS ON
STEP	INSPECTION		ACTION
1	CHECK SPEED CONTROL OPERATION Test drive the vehicle and operate the cruise control. Does the cruise control operate correctly?	Yes	Go to next step.
1		No	See SYMPTOM TROUBLESHOOTING CHART-CRUISE CONTROL to continue diagnosis of the cruise control system.
2	RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS Retrieve the recorded DTCs from the PCM continuous and on-demand self-tests. Are any DTCs retrieved?	Yes	See DIAGNOSTIC TROUBLE CODE (DTC) INDEX - POWERTRAIN CONTROL MODULE (PCM) .
2		No	Go to next step.
3	RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS Retrieve the recorded DTCs from the instrument cluster continuous and on-demand self-tests. Is DTC U0100 retrieved?	Yes	CLEAR the DTCs. CYCLE the key and wait 10 seconds. REPEAT the self-test. lfDTCU0100 is retrieved again, go to step 5.
3		No	Go to next step.
4	CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP CONTROL ACTIVE COMMAND USING THE SCAN TOOL Key in ON position. Enter the following diagnostic mode on the scan tool: Instrument Cluster DataLogger Select the instrument cluster speed control indicator (SC_SET) active command. Command the speed control indicator on then off again. Observe the speed control indicator. Does the speed control indicator illuminate when commanded on and turn off when commanded off?	Yes	Go to next step.
4		No	Go to step 6.
5	CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion damaged pins pushed-out pins Connect the all the PCM connector and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	INSTALL a new PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION . TEST the system for normal operation.
5		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
6	CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for. corrosion damaged pins pushed-out pins incorrectly installed bulb sockets burnt-out bulbs Connect all the instrument cluster connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	INSTALL a new instrument cluster. See INSTRUMENT CLUSTER . TEST the system for normal operation.
6		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.