8206code.fm Page 161 Tuesday, July 7, 1998 11:57 AM
DIAGNOSTIC CODE 7-1 Test 100
Test 200
Checking for a short to ground
Checking for a short to ground in the switch 1. With the ignition key in the OFF position, check for continuity from either pin on the service brake switch to a good ground. Engage and disengage the service brake.
If at any time there is continuity between the switch and ground, replace the service brake switch. Retest to be sure the problem has been corrected. Figure 263 — Continuity from Pin B2 to Ground
1. Disconnect the J1A and J1B V-MAC II module connectors from the V-MAC II module.
If there is no continuity with ground, there is a break in the wire which supplies the service brake signal to J2 connector pin B2. Repair or replace the wire. Retest to be sure the problem has been corrected.
2. Check for continuity from J2 connector pin B2 (the service brake signal [+] line) to a good ground. 3. Check for continuity between J2 connector pin B2 (the service brake signal [+] line) and each of the other pins (one at a time) on the J1A, J1B and J2 connectors.
If there is continuity with another pin or to ground, locate and repair the short in the harness. Retest to be sure the problem has been corrected. If there is no continuity, proceed to Test 200.
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